Timeusb 12V 140Ah Smart
#3 in 100 Ah classFull review
For boaters and RV owners who want more runtime than a 100Ah battery without changing their Group 31 battery tray.
Amazon $299.99$299.99
The Timeusb 12V 140Ah Smart is the better 12V lithium battery overall, rated 4.0 to 3.7. The Timeusb 12V 140Ah Smart leads on value and output. The Epoch 12V 105Ah Essential wins on warranty and cold weather. The Timeusb 12V 140Ah Smart costs $249.01 less ($299.99 vs $549).
Epoch 12V 105Ah Essential
#8 in 100 Ah classFull review
For boat and RV owners who charge below freezing and want a Group 24 battery with heating and Bluetooth built in. You pay a premium over budget brands for the heater, the app and the longer warranty.
Epoch $549$549
Prices were last checked October 31, 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 Timeusb 12V 140Ah Smart for value ($0.17 per rated Wh vs $0.41 per rated Wh) and output (150 A continuous (about 1,920 W at 12.8 V) vs 105 A continuous (about 1,340 W at 12.8 V)).
- Choose the Epoch 12V 105Ah Essential for warranty (11-year warranty vs 5-year warranty) and cold weather (self-heating, so it charges below freezing vs stops charging below freezing (no heater)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 100 ah class 12V lithium battery; a clear win is highlighted. How we rank explains each one.
| Factor weight | Timeusb 12V 140Ah Smart | Epoch 12V 105Ah Essential |
|---|---|---|
| Overall rating | 4.0/5 | 3.7/5 |
| Value 35% | 89 $0.17 per rated Wh | 49 $0.41 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Output 15% | 100 150 A continuous (about 1,920 W at 12.8 V) | 55 105 A continuous (about 1,340 W at 12.8 V) |
| Warranty 15% | 50 5-year warranty | 100 11-year warranty |
| Cycle life 10% | 50 4,000 cycles at 100% depth, maker rating | 50 4,000 cycles, maker rating |
| Cold weather 10% | 60 stops charging below freezing (no heater) | 100 self-heating, so it charges below freezing |
Specifications
| Timeusb 12V 140Ah Smart | Epoch 12V 105Ah Essential | |
|---|---|---|
| Capacity | ||
| Rated capacity | 140 Ah (1,792 Wh) | 105 Ah (1,344 Wh) |
| Nominal voltage | 12.8 V | 12.8 V |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 4,000 at 100% depth | 4,000 |
| Price per Wh | $0.17 | $0.41 |
| BMS | ||
| Continuous discharge | 150 A | 105 A |
| Peak discharge | 700 A for 1 s | 200 A for 10 s |
| Max charge current | 140 A | 100 A |
| Low-temperature charging | Charge cutoff only | Self-heating |
| Bluetooth monitoring | Yes | Yes |
| Series / parallel | up to 4 in series, 4 in parallel | up to 4 in series, 4 in parallel |
| Build | ||
| Case size | Group 31 | Group 24 |
| Dimensions | 13 x 6.77 x 8.5 in | 10.25 x 6.75 x 9.00 in |
| Weight | 28.1 lb | 22.1 lb |
| Terminals | M8 bolt | M8 female |
| Water resistance | IP65 | IP54 |
| Warranty | 5 years | 11 years |
| Released | 2024-10 | 2026-07 |