Skip to content
Lion Yard Trading
Mercedes-Benz · High-Voltage Battery & Charging

Battery management system (BMS)

The electronics monitoring every cell's voltage and temperature, balancing them, and deciding what the pack is allowed to do.

Also called BMS.

How you know it is this

  • Implausible state-of-charge readings
  • A pack that will not charge or discharge fully
  • A high-voltage fault with cells that measure fine
  • Communication faults with the battery

Worth knowing before you buy

  • A BMS FAULT LOOKS EXACTLY LIKE A FAILING PACK from the driver's seat, and the difference in cost is enormous. Always established before anything else.
  • It is coded and matched to the pack it manages.
  • Sometimes serviceable separately, sometimes integral to the pack. Which decides the scale of the job.

What we need to quote it. The chassis number and the fault codes. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Battery packModules and cellsCoolant plates and linesBattery managementContactorsFuse and service disconnectHousing and underbody shield
High-voltage battery — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the traction battery

All high-voltage battery & charging parts
Get in touch

Battery management system (BMS) for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)