More capacity, more freedom – without replacing your existing system.
The BOS LE300 is the smart lithium upgrade for your existing 12V lead-acid battery. Whether AGM, GEL, or wet cell – simply connect the LE300 to the positive and negative terminals and immediately benefit from additional capacity. No modifications to the charging system, no cable clutter: true plug & play. Simply choose the right size for your needs – from 28 Ah to 168 Ah.
Why the LE300 changes your electrical system
Conventional lead-acid batteries quickly lose performance when operated continuously without being fully charged – sulfation and limited cycle life often become noticeable after just one to three years. The LE300's intelligent battery management system (BMS) cleverly distributes load and charge cycles between the lead-acid and lithium batteries, extending the lifespan of both to up to 10 years . This way, you get the best of both technologies.
Safe travels – even in sub-zero temperatures
The integrated LiFePO4 cells are among the safest lithium cells on the market. They are thermally and chemically completely stable and protected by numerous safety features: overcurrent, overvoltage, short circuit, deep discharge, and reverse polarity protection are all standard. Thanks to integrated cell heating, the LE300 operates reliably down to -20 °C – perfect for anyone who wants to travel even in winter.
Modular and scalable – grows with your plans
Need more capacity later? No problem. Multiple LE300 modules can be connected and expanded at any time. Each module has its own BMS, ensuring your system remains redundantly protected. Even large peak loads are reliably covered by the combined use of lead-acid and lithium batteries – without limitations or unexpected system shutdowns.
Compact, lightweight, flexibly mountable
The LE300 modules are intentionally compact and lightweight. They fit even in tight installation spaces and can be mounted horizontally, vertically, or vertically – you decide where they fit best. Compared to a pure lead system, you save a significant amount of weight.
Technical data
| Cell technology |
LiFePO4 Lithium |
| Battery voltage |
12 VDC |
| Available sizes |
28Ah | 56Ah | 112Ah | 168 Ah |
| Usable capacity |
90% of nominal capacity |
| Winter operation |
Down to -20 °C (integrated cell heating) |
| Certifications |
E1 mark (motor vehicles), CE |
Included in the scope of delivery
- LE300 battery module in the selected size
- RAST 5 connector with 20 cm cable
- Battery cable set 1400 mm
- Replacement fuse for car mini 20 A
- Instructions for use
Designed and manufactured in Germany – with a passion for quality down to the last detail.
