Ohmmu Group 24 100Ah Lithium 12V Deep Cycle Battery Review — Is It Worth It? [2026]
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Ohmmu Group 24 100Ah Lithium 12V Battery
A drop-in LiFePO4 replacement for standard Group 24 trays, with Bluetooth monitoring, self-heating and an 18 lb body.
Is the Ohmmu Group 24 lithium worth buying?
If you are replacing a heavy lead-acid house battery in an RV, van or boat, yes. It is the same Group 24 footprint with roughly double the usable capacity (LiFePO4 gives up to 95% usable versus about 50% for lead-acid, per Ohmmu), at a third of the weight. Built-in Bluetooth monitoring and self-heating are the extras that justify $599 over the bargain lithium crowd. Just remember this is a house or deep-cycle battery, not a starter battery.
Same size, twice the usable power
This is the Adventure Series Group 24: 260 x 168 x 219 mm (10.25 x 6.6 x 8.6 in), threaded M8 terminals, and it fits standard Group 24 trays and brackets with no modifications. The listing page has a single product photo, so this review leans on the written specs.
What you get
100Ah / 1,280Wh LiFePO4
The 100Ah rating works out to 1,280Wh. LiFePO4 can use up to 95% of its capacity while lead-acid is typically limited to about 50%, so real runtime roughly doubles.
Bluetooth app
The Ohmmu Energy app (iOS and Android) shows voltage, state of charge, temperature and runtime live, so you are not guessing how much is left.
Self-heating cells
Tested to -20°F, with built-in heating that warms the cells during charging in extreme cold, protecting the cells. Compatible use range is listed as -20°F to 140°F.
Series and parallel
Link up to 6 in series for a 72V+ system or up to 10 in parallel for a 1,000Ah bank. Ohmmu rates it at 6,000 cycles at 80% depth of discharge with a 10-year warranty.
Full spec sheet
| Chemistry | LiFePO4 |
| Capacity | 100Ah / 1,280Wh |
| Dimensions | 260 x 168 x 219 mm (10.25 x 6.6 x 8.6 in) |
| Weight | 18 lb |
| Terminals | Threaded insert (M8) |
| BCI group | 24 |
| Cycle life | 6,000 cycles @ 80% DoD |
| Expansion | Up to 6 series / 10 parallel |
| Monitoring | Bluetooth, Ohmmu Energy app |
| Warranty | 10-year limited (full replacement first 4 years) |
| Spec sheet | Listed as coming soon |
Pros & Cons
Pros
- Fits Group 24 trays with no modifications.
- A third of the weight of lead-acid.
- Bluetooth monitoring and self-heating included.
- 10-year limited warranty with 4 years of full replacement.
- Expandable to large banks.
Cons
- $599 is a lot compared with budget lithium.
- Deep-cycle use; it is not sold as a starter battery.
- Only one product photo and the spec sheet is marked coming soon.
- Ships with threaded M8 terminals, so check your cables.
Answers before you buy
Will it fit my existing tray?
Does it work in the cold?
How long is the warranty?
Can I connect more than one?
What are the terminals?
A strong RV and van upgrade
Light, expandable, monitored and warm in winter. Editorial score only, not a customer rating.
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