Ultimatron ULS 12.8 V 100 Ah Bluetooth under-seat battery
Ultimatron ULS 12.8 V 100 Ah Bluetooth under-seat battery: 12.8 V 100 Ah LiFePO4, 1280 Wh, Smart Bluetooth BMS and up to 150 A continuous discharge.
Check charger, alternator, solar, cables and fuses.
Ultimatron ULS 12.8 V 100 Ah Bluetooth under-seat battery is a 1280 Wh nominal LiFePO4 service battery with BMS and Bluetooth monitoring for motorhomes, marine and off-grid systems.
The benefit is not only low weight: stable voltage, smartphone monitoring and deep usable capacity make energy availability more predictable while travelling.
Why choose this LiFePO4 battery
The BMS monitors cells, current and operating conditions; Bluetooth 4.0 provides status through the compatible app. Charging requires the correct LiFePO4 profile.
Technical specifications ULS12-100
| Part number | ULS12-100 |
| Voltage | 12.8 V |
| Capacity | 100 Ah |
| Energy | 1280 Wh |
| BMS | Smart Bluetooth 4.0 |
| Cycles | >6000 cycles at 80% DoD |
| Charging | 30 A recommended, 50 A max |
| Discharge | 150 A continuous |
| Dimensions | 35.5 × 17.5 × 18.8 cm |
| Weight | 12.6 kg |
Everyday runtime
At 80% usable energy and 90% inverter efficiency, 1280 Wh nominal becomes about 922 Wh AC: roughly 9.2 hours at 100 W or 1.8 hours at 500 W, excluding startup surges.
Current, temperature, cables and fuses must respect BMS and manual limits. Check alternator and solar charging before replacing a lead battery.
Frequently asked questions
How long will a 100 W load run?
At 80% use and 90% efficiency, about 9.2 hours. Actual runtime depends on load, temperature and losses.
Does Bluetooth replace a battery monitor?
The app reads BMS data and is useful for checks; available functions depend on model, app and installation.
Can I use my old lead charger?
Only if its maker confirms a compatible LiFePO4 profile. Alternator, solar controller and wiring must also be checked.
Is it suitable under a seat?
The ULS model is designed for that format; still measure the compartment, ventilation, mounting and terminal access.
Can several batteries be connected?
Only in manual-approved configurations, with compatible units, protection and balanced cables.
