9 Best Group 24 Battery | Cut Weight, Keep Runtime

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The one built to fire an engine in subzero weather — 710 cold-cranking amps and a sealed AGM design that won’t spill in the trunk.

This is the odd one out on the list — and that’s deliberate. Most Group 24 batteries here are built for deep-cycle work like running a trolling motor over many hours. This Mighty Max is built for the opposite job: dumping a short, massive burst of current to spin a starter motor on a cold morning. Cold-cranking amps (CCA) measure how much starting muscle a battery delivers at 0°F. At 710 CCA and a 120-minute reserve capacity, this battery cranks a car engine reliably and keeps the lights on if the alternator ever quits. It’s a genuine starting battery, not a deep-cycle unit.

The sealed Absorbent Glass Mat (AGM) design means no liquid acid to slosh or spill — a real advantage in a Jeep, tractor, or any vehicle that sees rough terrain. Fitment is where this battery shines, and the pattern across its reviews says so: owners overwhelmingly talk about how well it slots into the vehicle they bought it for. One reviewer noted that it fit their Jeep perfectly, arrived well-packaged, and started strong right from the start. Another put it in a tractor and had no complaints. It’s also sealed against vibration and shock, mounts in multiple positions (just not upside down), and comes with mounting screws in the box. A 3-year warranty covers it.

Here’s where the honest caveat lands. This battery’s reviews are more mixed than the lithium units on the list — and the biggest caution is about long-term life. A few owners found their units aging faster than expected, including one who said, “First unit arrived dead (0 volts). Second lasted just over a year.” That said, this is a well-reviewed battery overall with fitment being by far its strongest suit. If you keep it on a maintainer between drives and don’t deep-discharge it (which will wreck any lead-acid starting battery), you’re playing to its strengths: reliable first-turn cranking and a proper Group 24 drop-in fit, including for start-stop vehicles.

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Rated for a 15,000-cycle service life, and built around cells designed to hold up in marine and RV environments.

When an RV owner swaps flooded lead-acid for lithium, the first thing they notice isn’t the weight — it’s that the fridge stops killing the battery overnight. That’s the exact change buyers of this GrenerPower describe. In a 16-foot camper, two of these units reportedly ran the rig for two days with barely any voltage drop. In a 25-foot travel trailer, a buyer replaced a single flooded lead-acid 4D battery with three of these wired in parallel for a combined 300A and cut significant tongue weight out of the equation. That parallel setup is one of the strongest arguments for this battery: it allows up to 4S4P expansion, meaning you can build a 20.48kWh bank with 16 units if you ever want a full home energy storage setup.

The physical package is a straight Group 24 replacement — 10.23 by 6.61 by 8.3 inches — and it also drops into Group 27 and 31 boxes if you have a slightly larger compartment. The cells are cylindrical A+ grade rather than prismatic, and cylindrical cells are generally more tolerant of vibration, which is one reason this battery carries a low-temperature additive spec and a 5-layer BMS protection system (overcharge, overdischarge, short circuit, overcurrent, overheat). That’s the kind of durability you want on a boat that sees rough water. Its 15,000-cycle rating is the highest on this list.

The trade-off is one you’ll see repeated across lithium batteries: this is a deep-cycle energy storage battery, not a starting battery. The manufacturer states clearly that it is not for car battery, starting, or golf cart applications. So if you were hoping for a single battery that does both trolling motor and car cranking, this isn’t it. But for RV, boat, and solar trolling motor duty, it’s an excellent fit — and the review pattern here mirrors what you’d want: buyers consistently mention working all day, easy installation, and quick recharging from a 20-amp solar setup.

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App-monitored power in a 19.73-pound package — the lightest lithium on this list, with real-time data from your phone.

If you hate guessing how much charge is left, this is the pick for you. The HumsiENK pairs with a dedicated Bluetooth app that shows voltage, temperature, state of charge, and current draw in real time — so you know exactly how much juice is left before you point the trolling motor out of the cove. The BMS is an upgraded 100A smart version, and users describe the app as updating several times per second with useful per-cell detail. The Bluetooth connection itself is one of the aspects most discussed in reviews, and it earns mostly positive notes — but it’s flagged as mixed, meaning a few buyers have had connection hiccups. The app side isn’t perfect, but it’s a genuinely useful tool when it works.

Physically this is the lightest LiFePO4 battery on the list at 19.73 pounds — noticeably lighter than the MARSENERGY at 21 pounds and well under the Wattcycle at 23.2 pounds. It self-describes as over 60% lighter than a comparable lead-acid battery. The shape is a straight Group 24 fit at 10.2 by 6.6 by 8.2 inches, and it drops into Group 24 through 31 boxes. It’s rated IP65 waterproof (spray-rated, not submersible), carries A+ grade LiFePO4 cells, and supports up to 4S4P expansion for a 48V, 20.48 kWh system. The manufacturer rates it for up to 15,000 cycles and a 10-year lifespan.

One real-world note from the buying pool: these batteries can accept more amperage to an inverter than lead-acid units of similar rating, which makes them genuinely useful for DIY power station builds. One buyer ran an 8,000-BTU window air conditioner in Eco mode for eleven hours before it hit 50%. A separate buyer did flag that an overheated terminal occurred while running a 780W shop vac for fifteen minutes — the seller’s diagnosis was a short terminal bolt reducing contact area, and recommended using the longer bolts included in the box. So make sure you bolt up terminals properly with good contact area.

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Value-priced lithium that gets the fundamentals right — 100Ah of usable power, A+ grade cells, and reliable repeat performance.

For a mid-tier price, this WattCycle fights well above its weight class on paper. You get 100 amp-hours of usable capacity, a 100A BMS (rated to disconnect automatically if discharge current exceeds 300±50A), A+ grade cells rated for up to 15,000 cycles, low-temperature protection down to -4°F, and certifications including SDS, UN38.3, FCC, CE, and ROHS. Its compact footprint — 10.2 by 6.6 by 8.2 inches at 23.2 pounds — is a straight Group 24 fit and also compatible with 27 and 31 boxes. That’s a lot of the same specs as the pricier batteries on this list at a mid-tier price point.

What owners consistently mention is that the battery simply works — reliable power delivery, consistent charging behavior, and performance that matches expectations. It’s the battery a buyer reaches for when they need a dependable trolling motor assist or medium-draw RV appliance power without paying top of the stack. One buyer mentioned that even after a difficult experience with a BMS cold-shutdown, WattCycle honored the five-year warranty and replaced the affected batteries — which speaks to the brand standing behind the product when things go sideways.

The honest caveat here is that the brand is younger than the legacy lead-acid names, and a few buyers have had BMS issues — most notably after a firmware update to the companion Bluetooth app, which in some cases caused connection failures and, in isolated instances, BMS lockups after a year of use. That’s a real risk with any newer lithium brand, and it’s why a warranty matters. But the majority of owners mention the batteries hold strong, especially for trolling-motor and medium-draw duty. Worth noting: this battery supports up to 4 batteries in series or 4 packs in parallel, scaling to a 20.48kWh system.

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The one with grab handles — you can actually carry it across the field without needing two hands and a spotter.

If your Group 24 battery gets moved around a lot — between vehicles, into a truck bed, onto a boat, into a tent — this is the pick that solves a problem nobody talks about until they experience it: hauling the thing. The Power Queen weighs just 20 pounds, but the feature buyers keep mentioning is the built-in carry handles. Field users love it — one HAM radio operator noted the handles make moving it around genuinely easy and said the size is right.

The core delivery is still the same 100Ah LiFePO4 package as its peers. It’s a true drop-in Group 24 replacement — the manufacturer states fitting a standard Group 24 box is instantaneous with no wiring changes. Usable energy is stated as 1,280Wh, all of which is usable because LiFePO4 can be discharged nearly 100% without harming the battery. The BMS uses 20+ protective circuits, the cells are EV-grade LiFePO4, and the battery supports 4P4S expansion up to a 51.2V 400Ah bank — 20.48kWh in total. It carries a 5-year warranty and a 10-year design life.

One honest caveat: this is specifically an energy-storage battery, and the manufacturer states plainly it’s not for engines or golf carts. There’s also a small installation note worth reading — the included screws should be paired with gaskets under 2mm to prevent loosening or overheating at the terminals. Some owners have also used this for interesting off-grid jobs — one buyer running a CPAP machine with humidifier during hurricane season reported it lasted the night on a single charge, and separately powers their Starlink Mini. For a battery that’s usually marketed to RV and trolling motor buyers, that kind of flexibility is a bonus.

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Built with a marine-grade upgrade for the trolling-motor owner — waterproof, salt-spray resistant, and app-monitored from the dock.

This is the battery for the angler. Redodo built the BMS here specifically for trolling motor service, with waterproofing plus salt spray and corrosion protection — features you don’t find emphasized on the general-purpose lithium batteries on this list. That matters if you’re regularly launching into saltwater or fishing in humid coastal environments. Beyond the environmental protection there’s a low-temperature cut-off function, so discharging stops safely when the temperature swings cold. The Bluetooth 5.0 module pairs with the Redodo phone app and shows voltage, current, power, and remaining capacity. Range is limited — you need to be within about 30 feet of the battery — but for a boat or RV, that’s plenty.

Runtime on real-world trolling duty is where the reviews get specific. One buyer ran a 55-pound-thrust trolling motor for four hours in high wind at 40% to 80% speed and finished at 78% charge. That’s the kind of real-world shaping you can’t fake. The same buyer noted it outperformed lead-acid, which would typically be down to about half charge after five hours in the same conditions and start delivering weak thrust. The battery also charges fast with a compatible lithium charger.

Two things to know before you commit. First, the app-monitoring part is not frictionless — you need to be within Bluetooth range, and the extended range on some setups may not survive rough weather. Second, this battery specifically says it arrives partially charged (one owner reported about 20%), and the manufacturer recommends a dedicated lithium charger with 0V capability to wake it up properly. Buy a proper charger at the same time. One buyer also found that older Noco Genius chargers aren’t compatible — the G7200 v2’s lithium mode delivered only 3A output and the battery dropped to standby after about 30 seconds. Make sure your charger supports the LiFePO4 profile.

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The premium LiTime — same Group 24 fit as the rest, but with a reputation for capacity that actually matches its label.

LiTime has built a name for itself in the lithium battery space, and this Group 24 unit is their entry into that fitment. It pairs 100Ah (1,280Wh) with an automotive-grade BMS, 4,000+ cycles at 100% depth of discharge, and a 10-year design life. Crucially, this battery is the only pick on the list that mentions AIG product liability insurance coverage — an additional, verifiable layer of protection beyond a standard warranty. That’s a subtle but real differentiator for anyone nervous about putting a lithium battery in their camper or boat.

The physical package is a straightforward Group 24 drop-in — 10.24 by 6.61 by 8.27 inches, 21 pounds — with no Bluetooth and no app, and the manufacturer is explicit that it’s not for starting engines, golf carts, or jacks. This is pure energy storage. In the field, the pattern that emerges is capacity testing out to spec. One owner who tested their battery down to the watt-hour reported it hit exactly what was advertised, and another described it as the best value of the lithium batteries they’d tried. Campers running these alongside solar arrays have used them for six months and reported no drop-off. And unlike the budget tier — some of whom have had BMS issues after a year — LiTime’s reviews uniformly describe steady, consistent performance.

Two honest notes: this battery does not come with Bluetooth monitoring, so you don’t get the live data view you’d find on the HumsiENK or Redodo units. And there’s a small compatibility caveat for marine users: the manufacturer notes it’s not compatible with MerCruiser or Mercury motors without a current regulator. For most RV, camper, and trolling-motor uses, that won’t matter. It also expands up to 4P4S for a 20.48kWh bank if you want to scale up later.

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The heavy sealed AGM pair for stationary backup duty — no Bluetooth, no app, just simple lead-acid reliability where the battery stays put.

Here’s the case for staying with lead-acid: some jobs don’t need lithium’s light weight or deep discharge depth. If a battery is going to sit in a UPS cabinet, on a sump pump, or inside an electric wheelchair and rarely move, then a sealed AGM is a perfectly sensible and often cheaper answer. This NPP unit is a Group 24 sealed VRLA (valve-regulated lead-acid) battery, sized at 10.76 by 8.46 by 6.61 inches with T14 terminals, and it’s rated for 700A of surge current for up to five seconds — enough for pumps and motor-driven equipment that briefly spike on startup. Rated at 80Ah, in a two-pack.

The advantages of AGM here are practical: sealed design means no watering and no leaks, low self-discharge of about 3% per month means it holds charge during long storage, and the operating range spans 5°F to 122°F. It’s also backed by UL, CE, ISO9001, and ISO14001 certifications — one of the few batteries on this list calling out multiple standards bodies. And the physical design (deep-cycle, low internal resistance around 5mΩ) makes it a natural fit for repetitive discharge jobs like sump pump backup or mobility wheelchair duty.

Two realities to accept if you go this route. First, at 55.8 pounds for the pair, this is the heaviest option on the list — you’re trading portability for cost, though hopefully the installation is a one-and-done situation. Second, an owner did flag that these batteries are “not intended for large current draw applications” — so for a winch motor or a high-draw inverter, this isn’t the right pick. For their intended uses — UPS backup, home security panels, sump pumps, RVs, and mobility wheelchairs — the review pattern is solid. One wheelchair owner said it was a perfect fit for a Quantum Q-6 electric wheelchair, lasting longer between charges. Another user running them for two years in an RV reported no issues and good amp-hours with their solar panel.