Epoch 12V 300Ah Essential
#1 in LargeFull review
For RVs and boats that want a large, heated, Bluetooth-monitored bank in one Group 31 case. It suits cold-weather users who would otherwise wire up three 100Ah batteries.
Epoch $1,249$1,249
3.6/5
For off-grid and RV systems that need the most storage per inch. It holds 4 kWh in a compact case with Bluetooth monitoring.
- 320 Ah (4,096 Wh)Capacity
- 200 AContinuous output
- Charge cutoff onlyCold charging
- YesBluetooth
- 5 yearsWarranty
- $0.20Price / Wh
Check price at Amazon$829.99
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 4 kWh in a 14.5 in case leaves room for other gear
- Bluetooth app shows charge level without a shunt
- Stops charging below freezing to protect the cells
Cons
- 57 lb is heavy to install alone
- 200A BMS limits it to roughly a 2,000W inverter despite the large capacity
- No independent capacity test found
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | EA-A40128B-1C |
|---|---|
| Capacity | |
| Rated capacity | 320 Ah (4,096 Wh) |
| Nominal voltage | 12.8 V |
| Chemistry | LiFePO4 |
| Rated cycle life | 4,000 at 100% depth |
| Price per Wh | $0.20 |
| BMS | |
| Continuous discharge | 200 A |
| Low-temperature charging | Charge cutoff only |
| Bluetooth monitoring | Yes |
| Series / parallel | up to 4 in series, 4 in parallel |
| Build | |
| Dimensions | 14.49 x 7.44 x 10.63 in |
| Weight | 57.2 lb |
| Water resistance | IP65 |
| Warranty | 5 years |
Alternatives in this size
LiTime 12V 230Ah Plus
#2 in LargeFull review
For RV and off-grid owners who want one large battery instead of a pair. It also has enough BMS current for a 2,000W inverter.
Amazon $484.49$484.49
Renogy 12V 200Ah Core Mini
#4 in LargeFull review
For RV and van builds that want a large, low-cost bank in one box from a known brand. Cold-climate users should look at a heated battery instead.
Amazon $593.99 Amazon $653.99$593.99
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