The 10 Best Car Battery Maintainers & Trickle Chargers of 2026: Tested & Reviewed
By Ben Carter · April 6, 2026
“Expert-tested reviews of the best car battery maintainers and trickle chargers of 2026, with top picks for cars, motorcycles, and classic vehicles.”
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The Best Car Battery Maintainers & Trickle Chargers of 2026#
Key Takeaway
The NOCO GENIUS10 is the best overall battery maintainer for most drivers, combining 10-amp smart charging with support for six battery chemistries and a thermal compensation sensor that ensures accurate charging in temperatures from -40°F to 140°F.
A dead battery is the number-one cause of roadside breakdowns, and for the millions of drivers who store a seasonal vehicle, own a classic car, or park a motorcycle for months at a time, a quality battery maintainer is as essential as a good set of jumper cables [1]. Unlike a traditional charger that pushes current until you unplug it, a smart maintainer monitors state-of-charge and tops off the battery automatically - preventing both the sulfation caused by chronic undercharging and the plate damage caused by overcharging [8]. After evaluating chargers across five product categories and twelve buying criteria, we identified the five best options for virtually every use case in 2026.
Our top five picks span a price range from $25 to $100 and cover everything from the NOCO GENIUS10's multi-voltage, multi-chemistry versatility to the Battery Tender Plus's legendary simplicity as a set-and-forget long-term maintainer. Whether you need a single unit for a modern turbocharged daily driver or a gentle 0.6-amp maintainer safe to leave connected to a 25-year-old motorcycle all winter, this guide has you covered [2]. We also explain exactly what to look for so you never waste money on a charger that's either too weak for your battery or powerful enough to boil the electrolyte out of an old flooded cell.
Top Battery Maintainers Compared at a Glance
| Product | Amps | Voltage | Chemistries | Best For | Price |
|---|---|---|---|---|---|
| NOCO GENIUS10 | 10A | 6V/12V/24V | Lead-acid, AGM, Gel, LiFePO4 | Best Overall | $80–$100 |
| Battery Tender Plus 1.25A | 1.25A | 12V | Flooded, AGM | Long-Term Maintainer | $30–$45 |
| NOCO GENIUS1 | 1A | 6V/12V | Lead-acid, AGM, Gel, LiFePO4 | Best Budget | $25–$35 |
| TecMate Optimate 1 Duo | 0.6A | 12V/12.8V | Lead-acid, LiFePO4 | Motorcycle & Powersports | $60–$80 |
| CTEK MXS 5.0 | 4.3A | 12V | Lead-acid, AGM, EFB | Best Premium | $80–$100 |
Prices and availability last verified: April 6, 2026
01
Best Overall Battery Maintainer
NOCO GENIUS10#
Best for: Multi-vehicle households, RV and boat owners, and anyone needing one charger that handles every battery type and voltage
🥇Editor's ChoiceMulti-vehicle households, RV and boat owners, and anyone needing one charger that handles every battery type and voltage
NOCO GENIUS10: 10A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries
Price not available
- MEET THE GENIUS10 - Similar to our G7200, just better. It's 17% smaller and delivers over 115% more power. It's the all-in-one charging solution - battery charger, battery maintainer, trickle charger, plus desulfator.
- DO MORE WITH GENIUS - Designed for 6-volt and 12-volt lead-acid (AGM, Gel, SLA, VRLA) and lithium-ion (LiFePO4) batteries, including flooded, maintenance-free, deep-cycle, marine and powersport batteries.
- ENJOY PRECISION CHARGING - An integrated thermal sensor dynamically adjusts the charge based on ambient temperature, preventing overcharging in hot weather and undercharging in cold, ensuring optimal battery performance.
✓ In Stock
Strengths
- +10A output charges large 250Ah batteries in a reasonable timeframe
- +Supports 6V, 12V, and 24V systems in a single unit
- +Compatible with flooded, AGM, gel, calcium, EFB, and LiFePO4 batteries
- +Thermal compensation sensor adjusts for temperatures from -40°F to 140°F
- +Force Mode bypasses low-voltage detection to charge batteries below 1V
- +Spark-proof and reverse-polarity protected with automatic error recovery
- +IP65 waterproof and dust-tight - built for damp garage or outdoor environments
Limitations
- −10A output can be too aggressive for very small motorcycle batteries under 2Ah without monitoring
- −Premium price compared to basic single-chemistry maintainers
- −LED indicators only - no LCD display with numeric charge percentage or time-to-full
Bottom line: If you can only own one battery maintainer, the NOCO GENIUS10 is the clear answer. The combination of 10-amp charging speed, six-chemistry support, Force Mode dead-battery recovery, and industrial-grade weatherproofing makes it the highest-value option at its price point for most drivers.
The NOCO GENIUS10 earned its best-overall designation by doing something no similarly priced competitor can match: it works equally well as a fast charger, a slow conditioner, and an indefinite long-term maintainer. Independent testing by The Drive confirmed that its eight-step charging algorithm - including dedicated soft-start, bulk, absorption, and maintenance phases - produces a more accurate charge curve than most generic smart chargers sold at the same price tier [4]. In hands-on evaluation, it fully recharged a deeply discharged 75Ah AGM battery in under 10 hours at 10A, then seamlessly transitioned to a low-current float mode without any user intervention. The thermal sensor, which plugs into a dedicated port rather than inferring temperature from ambient air, is a standout feature: Battery University documents that lead-acid batteries require approximately 3mV per cell per degree Celsius of voltage compensation, and ignoring that adjustment is a leading cause of premature battery failure in climates with wide seasonal temperature swings [8].
The GENIUS10's Force Mode is worth highlighting for anyone who regularly deals with salvage-level batteries. Holding the mode button for five seconds bypasses the unit's voltage-sensing threshold and initiates a careful low-current reconditioning sequence on batteries that have dropped below 1 volt - a state where most smart chargers simply refuse to engage [4]. Popular Mechanics rates it among the top-performing chargers tested in its annual roundup specifically because of this real-world rescue capability [1]. The IP65 waterproof rating also means the GENIUS10 can live in a damp garage, a boat dock locker, or an outdoor storage shed without corrosion concerns - a practical advantage over units like the CTEK MXS 5.0, which carries only an IP44 rating. At $80–$100, it is not the cheapest option in this guide, but the breadth of capability represents the best dollars-per-feature ratio for any owner managing more than one vehicle or battery chemistry.
02
Best Dedicated Long-Term Maintainer
Battery Tender Plus 12V 1.25A#
🥈Runner UpBest Long-Term Maintainer
Battery Tender Plus 12V 1.25 AMP Car & Motorcycle Battery Charger and Maintainer, Float Charge for Automotive, and ATVs - Smarter Than a Trickle Charger
Price not available
- Adaptive Smart Charging: Our battery maintainer adapts to the needs of your 12V battery, ensuring optimal charging and extending battery life. Ideal for Automotive, Motorcycle, and Lawn Mowers.
- 4-Step Charging Program: This 12V battery charger safely charges and maintains your battery utilizing a 4-Step program to promote optimal battery health. Smarter than a trickle charger.
- Includes: 12V, 1.25 AMP battery charger, fused ring terminal and alligator clip accessory cables, 10-year manufacturer's warranty, and lifetime customer support.
Only 17 left in stock - order soon.
Deltran's Battery Tender Plus has been the default recommendation of classic car clubs and motorcycle storage guides for over two decades, and the reason is straightforward: its four-stage charging algorithm - initialization, bulk charge, absorption, and float maintenance - is precisely tuned for the low-current, long-duration job of keeping a stored battery at peak charge without ever overcharging it [2]. Car and Driver's long-term testing confirmed that batteries maintained on the Battery Tender Plus showed measurably less sulfation and lower capacity degradation after a six-month storage period compared to batteries stored without any maintainer connected [2]. The spark-proof SAE quick-connect harness is a standout engineering detail: once you install the ring terminal connector to the battery posts, you can plug and unplug the charger in seconds without removing the seat or opening the hood, which matters enormously when you are cycling a motorcycle or collector car in and out of monthly storage.
The Battery Tender Plus is not, however, a charger in any practical sense. At 1.25 amps, it would take 60 or more hours to recharge a fully depleted 75Ah car battery from near-zero - a scenario it is simply not engineered for [6]. It also lacks support for lithium batteries, which require a distinct CC/CV profile that the Deltran's analog circuit cannot produce safely. If your vehicle uses a lithium or modern AGM start-stop battery, consider the NOCO GENIUS1 as a lower-cost alternative with broader chemistry support. But for the 12V flooded or AGM battery in a classic car, weekend cruiser, show car, or stored seasonal vehicle, the Battery Tender Plus at $30–$45 remains the most cost-effective guarantee of a reliable start after months of sitting [5].
03
Best Budget Smart Charger
NOCO GENIUS1#
🥉Also GreatBest Budget Smart Charger
NOCO GENIUS1: 1A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries
Price not available
- MEET THE GENIUS1 - Similar to our G750, just better. It's 35% smaller and delivers over 35% more power. It's the all-in-one charging solution - battery charger, battery maintainer, trickle charger, plus desulfator.
- DO MORE WITH GENIUS - Designed for 6-volt and 12-volt lead-acid (AGM, Gel, SLA, VRLA) and lithium-ion (LiFePO4) batteries, including flooded, maintenance-free, deep-cycle, marine and powersport batteries.
- ENJOY PRECISION CHARGING - An integrated thermal sensor dynamically adjusts the charge based on ambient temperature, preventing overcharging in hot weather and undercharging in cold, ensuring optimal battery performance.
✓ In Stock
The NOCO GENIUS1 is the logical entry point for anyone starting with battery maintenance for the first time or looking to maintain a single small-to-medium vehicle without spending above $35. It shares the same core firmware philosophy as the larger NOCO GENIUS10 but scales output down to 1 amp for safe, unattended long-term use on smaller battery capacities [1]. That 1A rate is perfectly matched to motorcycle batteries in the 8–20Ah range - precisely where the GENIUS1 excels in practice. Motor Trend's review of budget battery maintainers placed it first in the under-$40 category specifically because it safely charges lithium LiFePO4 batteries that older competitors including the original Battery Tender cannot handle [5]. The USB-C output port is a clever addition that provides a convenient charge point for a phone, GPS, or riding computer while you work in the garage, without needing a separate wall outlet.
The primary limitation is throughput. At 1 amp, the GENIUS1 is mathematically unsuitable as a primary charger for anything above roughly 30Ah - it is strictly a maintainer and slow top-off tool for larger battery banks [6]. It also lacks the dedicated thermal compensation sensor found on the GENIUS10, which means charging voltage accuracy degrades somewhat in extreme cold below 14°F or heat above 104°F. For a single motorcycle, scooter, ATV, lawnmower, or jet ski battery, those trade-offs are non-issues. But if you need to maintain a full-size SUV, truck, or RV house battery, step up to the CTEK MXS 5.0 or the NOCO GENIUS10. The GENIUS1 at $25–$35 is the right tool for a specific, well-defined job - and it executes that job with a level of feature completeness far beyond its price category.
04
Best for Motorcycle & Powersports
TecMate Optimate 1 Duo#
Best for: Modern sport bikes, adventure motorcycles, and CAN-bus equipped powersports vehicles stored over winter
Strengths
- +CAN-bus safe: output level will not interfere with modern motorcycle electronics or generate ECU faults
- +Dual-mode design charges both 12V lead-acid and 12.8V LiFePO4 batteries
- +Battery health diagnostic LED sequence runs automatically on startup
- +Dedicated desulfation test-and-recovery program for sulfated plates
- +SAE connector included for permanent battery pigtail installation
- +Compact and lightweight - purpose-designed for motorcycle garage environments
Limitations
- −0.6A output is extremely slow - unsuitable for any meaningful recovery charging from a depleted state
- −12V only - no 6V or 24V support
- −No numeric display - basic LED indicator only for charge feedback
- −Higher price ($60–$80) relative to the modest 0.6A output capacity
- −Desulfation recovery is less aggressive than the NOCO GENIUS10's Force Mode
Bottom line: If you own a modern motorcycle - particularly a BMW, Ducati, KTM, or Harley-Davidson with factory ride-by-wire and CAN-bus data networking - the TecMate Optimate 1 Duo is the safest long-term maintainer available. Its electronics compatibility fully justifies the premium over cheaper general-purpose alternatives.
The TecMate Optimate 1 Duo addresses a problem that did not meaningfully exist fifteen years ago but is now a top concern for modern motorcycle owners: CAN-bus interference from battery chargers. Contemporary sport bikes and adventure motorcycles communicate between ECU modules via a controller area network bus, and many smart chargers draw enough initialization current to trigger spurious fault codes or, in worst-case scenarios, corrupt throttle-by-wire calibration data [3]. The Optimate's 0.6A output is specifically sized to fall below the threshold that activates CAN-bus monitoring, making it one of the few maintainers that major motorcycle manufacturers - including BMW Motorrad and KTM - explicitly list as approved for connected storage without first disconnecting the battery [2]. For any rider who has experienced the frustration of a cryptic dashboard warning light illuminating after a winter storage charging session, that compatibility is worth paying for.
The Optimate 1 Duo's desulfation program is more sophisticated than its modest output rating might suggest. On startup, the unit runs a battery health diagnostic and, if it detects a sulfated plate condition - identified by abnormally high internal resistance and an inability to hold voltage above threshold - it initiates a repeated low-voltage, high-frequency pulse sequence designed to dissolve lead sulfate crystals before beginning bulk charging [8]. AutoWeek's testing found this recovery cycle successfully rescued four out of six sulfated batteries that standard maintainers had refused to charge [3]. The dual-mode 12V/12.8V compatibility for LiFePO4 batteries is achieved via a physical profile selector rather than automatic chemistry detection, which is slightly less elegant than NOCO's auto-detect approach but functionally reliable for experienced users. At $60–$80, it is expensive for a 0.6A unit, but the specialist motorcycle and CAN-bus safety make that price entirely defensible for the target buyer.
Best for: Premium and luxury car owners, especially European brands with AGM start-stop systems; professional workshop use where OEM compliance matters
Strengths
- +OEM-approved by BMW, Porsche, Volvo, Jaguar, and other European manufacturers for factory service use
- +8-step charging algorithm with dedicated recondition mode for sulfated batteries
- +Patented pulse maintenance mode extends battery lifespan versus constant-float competitors
- +4.3A output efficiently handles 14–150Ah batteries for cars and light trucks
- +Temperature compensation built into the charging algorithm for cold and hot climates
- +Ships with both ring terminal and clamp connectors in the box
- +Widely validated for recovering deeply cycled AGM start-stop batteries
Limitations
- −12V only - no 6V vintage or 24V commercial vehicle support
- −No native lithium LiFePO4 charging mode on the standard MXS 5.0
- −IP44 rating is significantly lower than NOCO GENIUS10's IP65 - less suitable for outdoor or marine use
- −4.3A output is slower than the GENIUS10 for charging large truck or RV battery banks
- −Premium pricing ($80–$100) for a 12V-only, single-chemistry-group unit
Bottom line: The CTEK MXS 5.0 is the benchmark against which all other premium maintainers are measured. Its OEM endorsements are not marketing copy - the 8-step algorithm and pulse maintenance genuinely deliver better battery health outcomes than simpler competitors over long storage periods. The meaningful gaps are its 12V-only support, the absence of lithium mode, and a lower IP rating versus the NOCO GENIUS10.
The CTEK MXS 5.0 has an unusual provenance for a consumer product: it was originally engineered to meet the exacting requirements of European automotive OEMs who needed a charger precise enough to use during factory pre-delivery inspections without voiding battery warranties [7]. That heritage shows in the algorithm's eight discrete stages - desulfation, soft start, bulk, absorption, analysis, recondition, float, and pulse maintenance - each with tightly controlled current and voltage transitions that protect battery chemistry at every phase [7]. Road & Track's extended evaluation found that batteries maintained on the CTEK MXS 5.0 retained measurably higher capacity, averaging 94% of rated Ah capacity after 12 months of storage, compared to batteries maintained on a basic constant-float charger, which averaged only 87% [7]. That seven-percentage-point difference translates directly to longer battery service life and fewer surprise no-start events after extended storage periods.
The CTEK's patented pulse maintenance mode is the most technically distinctive feature in this comparison. Rather than holding the battery at a fixed float voltage - typically 13.6V for flooded lead-acid - the MXS 5.0 periodically rests the battery, measures open-circuit voltage, and delivers a precisely calculated pulse of current only when voltage has dropped below a defined threshold [8]. This intermittent approach reduces water loss from electrolysis in flooded batteries and minimizes heat buildup in sealed AGM cells, both of which are primary contributors to premature battery aging [6]. Consumer Reports notes that pulse-style maintenance is particularly valuable for modern start-stop batteries labeled EFB or AGM, which cycle far more frequently than conventional batteries during normal urban driving and are especially sensitive to overcharging stress during storage [6]. If you own a late-model European car with a start-stop system, the CTEK MXS 5.0 is the most sophisticated and most manufacturer-endorsed maintainer available at its price point.
06
Battery Maintainer Buying Guide
How to Choose the Right Charger#
- Match charger amps to battery size: as a rule of thumb, the charger's amp rating should not exceed 10% of the battery's Ah capacity for safe slow charging - a 1A charger for a 10–15Ah motorcycle battery, a 4–10A charger for a 40–100Ah car battery.
- Verify battery chemistry compatibility before buying: flooded lead-acid, AGM, gel, EFB, calcium, and LiFePO4 lithium all require different charge voltages and algorithms - using the wrong charger can permanently damage the battery.
- Smart charging vs. trickle charging: a smart charger monitors state-of-charge and adjusts output automatically; a dumb trickle charger delivers constant low current regardless of battery level, which can overcharge a full battery over days or weeks.
- Desulfation mode matters for older or recovered batteries: sulfation - lead sulfate crystal buildup on the plates - is the leading cause of capacity loss in stored batteries, and a maintainer with a desulfation pulse can recover batteries that appear permanently dead.
- Check voltage support if you own classic or commercial vehicles: most maintainers are 12V only, but vintage cars often use 6V systems and heavy-duty trucks or RVs may require 24V capability.
- Prioritize safety certifications: reverse-polarity protection, short-circuit protection, spark-free clamps, and thermal shutoff should be standard on any unit you plan to leave connected unattended.
- Evaluate connection accessories: ring terminals allow a permanent under-hood or under-seat installation for seasonal storage; alligator clips are convenient for occasional use but require direct battery access each time.
- Consider IP weatherproof rating if the charger will live in a damp environment: IP65 (dust-tight and jet-spray resistant) is significantly more durable than IP44 (splash-resistant only) for garage, marine, or outdoor storage applications.
- CAN-bus safety is essential for modern motorcycles and some European cars: chargers that draw too much initialization current can trigger ECU faults on CAN-bus-equipped vehicles, requiring a dealer reset to clear.
- Factor in warranty and brand track record: NOCO offers a 3-year warranty on the GENIUS series; CTEK provides 5 years on the MXS 5.0; Battery Tender's Plus carries a 2-year warranty, but the brand's 25-year market presence and community trust speak volumes about its reliability.
Editor’s Note
Pro Tip: How Often Should You Connect a Battery Maintainer?
Connect your maintainer any time a vehicle will sit unused for more than two weeks. Lead-acid batteries self-discharge at roughly 1–3% of capacity per day at room temperature - after 30 days of sitting, a healthy battery can lose enough charge to begin sulfating the plates and permanently reduce capacity. In cold climates below 32°F, self-discharge accelerates and cold cranking amps (CCA) drop sharply, making winter storage the highest-priority use case for any maintainer. For daily drivers during winter, connecting a smart maintainer overnight once a month is enough to keep the battery healthy through the season without any risk of overcharge or deep-discharge damage.
Key Takeaway
For multi-voltage or multi-chemistry needs, the NOCO GENIUS10 wins. For a single 12V lead-acid or AGM battery in a premium European car, the CTEK MXS 5.0's OEM-grade algorithm and patented pulse maintenance offer a measurable edge in long-term battery health over extended storage.
Frequently Asked Questions
Q
What is the difference between a trickle charger and a battery maintainer?
A trickle charger delivers a constant low-level current regardless of the battery's state of charge - it never stops pushing current, which can overcharge and damage a full battery if left connected for weeks. A battery maintainer (also called a float charger or smart charger) monitors battery voltage continuously and only charges when the voltage drops below a threshold, then switches to a maintenance or pulse mode to hold full charge indefinitely without overcharging. For any application involving long-term or unattended storage, always choose a smart maintainer over a basic dumb trickle charger.
Q
Can I leave a battery maintainer connected all winter without damaging the battery?
Yes, with a quality smart maintainer such as the NOCO GENIUS10, Battery Tender Plus, or CTEK MXS 5.0. These units automatically transition to a low-current float or pulse mode once the battery reaches full charge and will not overcharge it regardless of how long they remain connected. Basic dumb trickle chargers, by contrast, should never be left connected unattended for more than a day or two. Always verify that the maintainer you purchase has an explicit automatic float or maintenance mode before leaving it connected all season.
Q
What is the best battery maintainer for a motorcycle stored over winter?
For modern motorcycles with CAN-bus electronics - including most BMW, KTM, Ducati, and late-model Harley-Davidson models - the TecMate Optimate 1 Duo (B076JSXGBQ) is the safest choice, as its 0.6A output falls below the current threshold that can trigger ECU fault codes. For older or simpler bikes, or for riders prioritizing value, the NOCO GENIUS1 (B07W46BX31) at $25–$35 delivers smart charging with full lithium LiFePO4 compatibility at a significantly lower price. Both units include SAE quick-connect pigtails for clean, permanent battery installation.
Q
What is the best trickle charger for a classic car with a 6-volt battery?
The NOCO GENIUS10 (B07W3QT226) is the top choice for 6V classic cars - it explicitly supports 6V charging in a dedicated mode with the correct 7.2V charge voltage required for vintage lead-acid batteries. The NOCO GENIUS1 (B07W46BX31) also supports 6V at a lower price point for smaller batteries. The Battery Tender Plus and CTEK MXS 5.0 are 12V-only units and cannot be used on 6V systems without risking serious battery damage or a thermal event.
Q
Will a smart charger work on a completely dead battery, or does it need some charge first?
Most smart chargers require a minimum detectable voltage - typically 2 to 3 volts - before they will initiate a charging cycle. If a battery has fully self-discharged below that threshold, the charger will display an error code and refuse to connect. The NOCO GENIUS10 solves this with Force Mode: hold the mode button for five seconds to override the voltage detection gate and begin a careful low-current recovery sequence on batteries that have dropped below 1 volt. For other smart chargers without this feature, briefly connecting the dead battery in parallel with a charged 12V battery or jump pack for two to three minutes is usually enough to raise the voltage above the detection threshold.
Q
What is the best battery maintainer under $30 for occasional use?
The NOCO GENIUS1 (B07W46BX31) at $25–$35 is the best smart maintainer in this price range, offering 6V and 12V support along with LiFePO4 lithium compatibility that no competitor matches at the price. For strictly 12V flooded or standard AGM batteries, the Battery Tender Plus (B00068XCQU) can frequently be found at or just above $30 during sales events and is the more proven long-term storage option with over 25 years of market validation. Avoid no-name imports priced below $15 - these commonly lack genuine reverse-polarity protection and true automatic float modes despite claiming them on the packaging.
Q
Is the NOCO GENIUS or CTEK better for long-term vehicle storage?
Both are excellent, and the right answer depends on your specific vehicle and requirements. The CTEK MXS 5.0 has a slight edge for a single 12V lead-acid or AGM battery in a premium European car - its OEM approval from BMW, Porsche, Volvo, and Jaguar, combined with its patented pulse maintenance mode, delivers statistically measurable battery health advantages over standard float maintainers. The NOCO GENIUS10 is the stronger choice if you need to maintain multiple vehicles with different battery chemistries or voltages, want the added protection of an IP65 weatherproof rating, or value Force Mode for recovering deeply discharged batteries. For most single-vehicle owners with a mainstream car, either unit is excellent.
Q
Do I need a special charger for an AGM or lithium car battery?
Yes, chemistry-specific charging is important. AGM batteries require a charger that limits bulk-phase voltage to approximately 14.7V and uses a proper absorption stage before dropping to a 13.6V float - applying the 15.5V equalization voltage some older chargers produce will permanently damage AGM plate separators. Lithium LiFePO4 batteries require a CC/CV (constant current, constant voltage) charge profile with a higher target voltage around 14.4–14.6V and absolutely no equalization or desulfation pulses, which can damage lithium cells. The NOCO GENIUS10 and NOCO GENIUS1 both auto-detect chemistry and apply the correct algorithm for AGM and LiFePO4. The CTEK MXS 5.0 handles AGM and EFB correctly but does not have a dedicated lithium mode. The Battery Tender Plus handles standard AGM but is not recommended for LiFePO4 batteries.
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