The BMS 6S–13S 25A is an electronic protection board with an integrated balancer, built for lithium-ion and lithium-polymer battery packs. One module covers eight series configurations: 6S, 7S, 8S, 9S, 10S, 11S, 12S and 13S. In practical terms, it fits 24 V, 36 V and 48 V packs used in electric scooters, electric bikes and electric motorcycles.
The board carries a continuous discharge current of 25A and measures 31.5 mm x 55.1 mm. It mounts inside the battery pack housing, where it continuously monitors the voltage of every cell. During use, it performs cell balancing across the whole pack.
Two protection functions are built into the same board. Over-discharge protection disconnects the pack once the lowest permitted voltage is reached. Over-charge protection stops charging when cell voltage climbs too high. As a result, the pack does not operate outside safe limits during either charging or discharging.
Key Benefits
- Eight configurations in one module — suits 6S, 7S, 8S, 9S, 10S, 11S, 12S and 13S packs, so a single board replaces eight separate ones.
- Cell balancing — the board equalises individual cell voltages throughout the entire service life of the pack.
- Over-discharge protection — the discharge cut-off disconnects the pack at the lowest permitted voltage threshold.
- Over-charge protection — charging is interrupted once voltage rises above the allowed level.
- 25A continuous discharge current — enough for mid-power scooter and e-bike systems.
- Compact 31.5 x 55.1 mm footprint — the board fits into narrow battery enclosures.
- Balance leads selected by S count — the configuration is set by which balance pads you connect.
Who Is This BMS For?
This board is intended for 6S to 13S lithium-ion and lithium-polymer packs. That range covers 24 V (7S), 36 V (10S) and 48 V (13S) nominal systems. Above all, it targets electric scooters, electric bikes and electric motorcycles running mid-power controllers.
Battery pack builders and repair technicians also use this module. For example, it works when replacing an old protection board or assembling a fresh pack from 18650 or 21700 cells. In addition, it suits power tool packs and small energy storage builds. Before assembly, decide how many cells you will wire in series. That choice determines which balance wire pads you use.
Technical Specifications
| Type | BMS protection board with balancer |
| Supported configurations | 6S, 7S, 8S, 9S, 10S, 11S, 12S, 13S |
| Continuous discharge current | 25A |
| Dimensions | 31.5 mm x 55.1 mm |
| Protections | Over-discharge protection, over-charge protection |
| Function | Cell balancing |
| Cell chemistry | Lithium-ion (Li-ion), lithium-polymer (Li-Po) |
| Mounting | Inside the battery pack |
Why Choose This Balance Board?
The main advantage is configuration coverage. Instead of stocking eight separate boards, you keep one. Therefore the same module serves a 24 V build and a 48 V build equally well. Secondly, at 31.5 x 55.1 mm the board is smaller than many single-configuration alternatives. Because of that, it slides into tight scooter and bicycle battery casings.
Furthermore, the 25A continuous discharge rating matches what most production scooter controllers draw. Balancing and both protections run on the same board as well. Consequently, the pack needs no separate balancing module alongside it.
Frequently Asked Questions
Which battery configurations does this BMS board support?
- It works with 6S, 7S, 8S, 9S, 10S, 11S, 12S and 13S packs.
- That includes 24 V (7S), 36 V (10S) and 48 V (13S) nominal systems.
- The configuration is set by the balance wire pads you connect.
Is this BMS suitable for an electric scooter or e-bike?
- Yes — the module is made for electric scooter, e-bike and electric motorcycle packs.
- The pack must use 6 to 13 lithium-ion cells wired in series.
- System current must stay within the 25A continuous discharge rating.
What does the 25A rating actually mean?
- 25A is the continuous discharge current, not the capacity.
- Capacity is measured in amp-hours (Ah) and depends on your cells.
- The 25A limit applies to discharge through the board.
Does the board balance the cells on its own?
- Yes — it monitors each cell voltage continuously.
- It equalises individual cell voltages while the pack is in use.
- No separate balancing module is required.
Where is the board installed?
- It mounts inside the battery pack housing.
- Its 31.5 x 55.1 mm size fits narrow enclosures.
- Balance leads connect according to your series count.
Can I use it with 18650 or 21700 cells?
- Yes — it suits packs assembled from 18650 or 21700 cells.
- Both lithium-ion and lithium-polymer chemistries are supported.
- It also works for replacing an old protection board during a repair.
Will it work for power tools or small storage builds?
- Yes, provided the pack uses 6 to 13 cells in series.
- Power tool packs and small energy storage systems are both covered.
- The 25A ceiling keeps it aimed at mid-power systems.
With eight series configurations, on-board cell balancing and both charge and discharge cut-offs in a 31.5 x 55.1 mm package, this BMS covers 24 V, 36 V and 48 V builds from a single part number. Choose your series count before assembly, wire the matching balance pads, and the same board serves scooter, e-bike and motorcycle packs alike.
There are no reviews yet.