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 output. The Power Queen 12V 125Ah Group 27 costs $16 less ($283.99 vs $299.99).
Power Queen 12V 125Ah Group 27
#4 in 100 Ah classFull review
For RV and boat owners with a Group 27 tray who want extra runtime and app monitoring for little more than a 100Ah battery.
Amazon $283.99$283.99
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 output (150 A continuous (about 1,920 W at 12.8 V) vs 100 A continuous (about 1,280 W at 12.8 V)).
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 | Power Queen 12V 125Ah Group 27 |
|---|---|---|
| Overall rating | 4.0/5 | 3.7/5 |
| Value 35% | 89 $0.17 per rated Wh | 87 $0.18 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) | 50 100 A continuous (about 1,280 W at 12.8 V) |
| Warranty 15% | 50 5-year warranty | 50 5-year warranty |
| Cycle life 10% | 50 4,000 cycles at 100% depth, maker rating | 50 4,000 cycles at 100% depth, maker rating |
| Cold weather 10% | 60 stops charging below freezing (no heater) | 60 stops charging below freezing (no heater) |
Specifications
| Timeusb 12V 140Ah Smart | Power Queen 12V 125Ah Group 27 | |
|---|---|---|
| Capacity | ||
| Rated capacity | 140 Ah (1,792 Wh) | 125 Ah (1,600 Wh) |
| Nominal voltage | 12.8 V | 12.8 V |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 4,000 at 100% depth | 4,000 at 100% depth |
| Price per Wh | $0.17 | $0.18 |
| BMS | ||
| Continuous discharge | 150 A | 100 A |
| Peak discharge | 700 A for 1 s | - |
| Max charge current | 140 A | 100 A |
| Low-temperature charging | Charge cutoff only | Charge cutoff only |
| 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 27 |
| Dimensions | 13 x 6.77 x 8.5 in | 12.13 x 6.69 x 8.31 in |
| Weight | 28.1 lb | 25.1 lb |
| Terminals | M8 bolt | M8 |
| Water resistance | IP65 | IP65 |
| Warranty | 5 years | 5 years |
| Released | 2024-10 | 2025-04 |