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
The Epoch 12V 300Ah Essential is the better 12V lithium battery overall, rated 3.7 to 2.8. The Epoch 12V 300Ah Essential leads on value. The Epoch 12V 300Ah Essential costs $1,350 less ($1,249 vs $2,599).
Battle Born 270Ah GC3 Heated
#8 in LargeFull review
For large RV and marine banks that want one heated 270Ah battery from a US maker and can handle the weight and cost.
Inverters R Us $2,599$2,599
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Epoch 12V 300Ah Essential for value ($0.33 per rated Wh vs $0.75 per rated Wh).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large 12V lithium battery; a clear win is highlighted. How we rank explains each one.
| Factor weight | Epoch 12V 300Ah Essential | Battle Born 270Ah GC3 Heated |
|---|---|---|
| Overall rating | 3.7/5 | 2.8/5 |
| Value 35% | 54 $0.33 per rated Wh | 0 $0.75 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Output 15% | 50 200 A continuous (about 2,560 W at 12.8 V) | 50 continuous current not published (neutral score used) |
| Warranty 15% | 100 11-year warranty | 50 warranty not published (neutral score used) |
| Cycle life 10% | 50 4,000 cycles, maker rating | 33 3,000 cycles, maker rating |
| Cold weather 10% | 100 self-heating, so it charges below freezing | 100 self-heating, so it charges below freezing |
Specifications
| Epoch 12V 300Ah Essential | Battle Born 270Ah GC3 Heated | |
|---|---|---|
| Capacity | ||
| Rated capacity | 300 Ah (3,840 Wh) | 270 Ah (3,456 Wh) |
| Nominal voltage | 12.8 V | 12.8 V |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 4,000 | 3,000 |
| Price per Wh | $0.33 | $0.75 |
| BMS | ||
| Continuous discharge | 200 A | - |
| Peak discharge | 400 A for 3 s | - |
| Max charge current | 200 A | - |
| Low-temperature charging | Self-heating | Self-heating |
| Bluetooth monitoring | Yes | - |
| Series / parallel | up to 4 in series, 4 in parallel | - |
| Build | ||
| Case size | Group 31 | - |
| Dimensions | 13.75 x 7.63 x 10.00 in | 22.83 x 7.09 x 13.15 in |
| Weight | 58 lb | 80.8 lb |
| Terminals | M8 bolt | 0.25 in brass blades |
| Water resistance | IP54 | - |
| Warranty | 11 years | - |