BTLi – B Series 12V Lithium Ion Battery with Bluetooth

The batteries of the BTLi series are maintenance-free lithium-ion rechargeable batteries (LiFePO4) with a service life expectancy of >5000 cycles and only 40% of the weight of lead-acid batteries. They use a built-in Battery Management System (BMS) for maximum reliability. Excellent for camping, outdoor and caravan but also e.g. for UPS systems, DC power supplies, security systems and as solar or wind energy storage.

The BTLi 12-120B and BTLi 12-100B also have a built-in Bluetooth interface, which can be used to monitor the charge level and battery status at any time via Android or IOS app.



  • Extreme Deep Cycle Life: Up to 20 times longer cycle life than lead-acid batteries, minimizing replacement costs and lowering total cost of ownership.
  • Excellent for the main application: RVs. Lightweight: About 40% of the weight of a comparable lead-acid battery.
  • Built-in Bluetooth interface for monitoring with Android or IOS app.
  • Built-in Battery Management System (BMS).
  • “Drop-in” replacement for lead-acid batteries.
  • Parallel connection of up to 4 batteries possible, but no series connection.
  • Higher Performance: Delivers twice the performance of a lead-acid battery, even at high discharge rates, while maintaining energy capacity.
  • Wide temperature range: 0°C~60°C.
  • Absolute intrinsic safety: By using lithium iron phosphate chemistry.


Model BTLi 12-100BBTLi 12-120B
Battery typeLiFePO4LiFePO4
Nominal voltage12.8V12.8V
Nominal capacity / Energy100.0Ah / 1280Wh120.0Ah / 1536Wh
Cycle Life>2000 cycles @1C 100%DOD>2000 cycles @1C 100%DOD
DimensionsLength306 ±2mm330 ±2mm
Width168 ±2mm173 ±2mm
Hight214 ±2mm220 ±2mm
Weight12.0 kg14.0 kg
ConnectionsM8 Screw connection, contact surface Ø 20 mmM8 Screw connection, contact surface Ø 20 mm
Cathode materialLiFePO4LiFePO4
Material of the anodeGraphiteGraphite
Material of the electrolyteLiPF6LiPF6
Enclosure material / enclosure classAcrylnitril-Butadien-Styrol (ABS)Acrylnitril-Butadien-Styrol (ABS)
Enclosure classIP65IP65
Permissible mounting positionMax. 90° to upright normal position (see picture above right)Max. 90° to upright normal position (see picture above right)
Internal resistance≤50mΩ≤20mΩ
Self-discharge<3% (@ 25°C / month)<3% (@ 25°C / month)
ChargingCharging voltage14.6 ± 0.2V14.6 ± 0.2V
Charging process0.2 C to 14.6 V, then 14.6 V, charging current to 0.02C (CC/CV)0.2 C to 14.6 V, then 14.6 V, charging current to 0.02C (CC/CV)
Charging current50A50A
Max. Charging current100A100A
End-of-charge voltage15.0V ± 0.2V15.0V ± 0.2V
DischargingNominal discharge current100A100A
Max. Discharge current150A (< 1s)150A (< 1s)
End-of-discharge voltage8.8V8.8V
Operating temperature ranges
(At 60±25% relative humidity)
Discharging temperature0°C – 60°C0°C – 60°C
Charging temperature0°C – 45°C0°C – 45°C
Storage temperature (fully loaded)0°C – 40°C0°C – 40°C
Recommended operating temperatureApprox. 20°CApprox. 20°C
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