About this replacement
Bionet BM1 Vet — 10.8V Li-ion Replacement Battery (BM1-BAT)
This 10.8V Li-ion battery replaces the OEM pack (BM1-BAT / BN180226) in the Bionet BM1 Vet veterinary patient monitor. Capacity is 3350mAh (36.18Wh), matching the original specification. It fits the portable BM1 Vet unit used for continuous vital signs monitoring during veterinary examinations and procedures.
- BM1 Vet platform fit: The BM1 Vet runs a single battery bay at 10.8V with a BMS handshake that checks cell chemistry and voltage on every boot. This replacement uses the same Li-ion chemistry and voltage rail, so the monitor's BMS recognises the pack and clears for normal operation.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the BM1 Vet platform and monitored BMS communication at each startup. The self-test passed without fault codes after the first full charge-discharge cycle.
- First-use protocol on medical equipment: After installation, let the device complete its full power-on self-test without interruption. The BM1 Vet runs a BMS verification sequence at startup — cutting power mid-cycle stores a false battery fault that persists until the next clean reboot.
Why the BM1 Vet shows a battery fault after a fresh swap
The BM1 Vet's BMS does not instantly trust a new cell. It checks internal resistance and voltage profile against stored OEM thresholds before clearing the battery status flag. A new Li-ion pack straight from packaging often sits at a partial state of charge — typically 40–60% — which can trip the device's low-battery threshold before a full charge cycle recalibrates the gauge. Run one complete charge from the mains before the first clinical use. After that cycle, the BMS registers the actual capacity and the fault clears.
Charge indicator stuck below 100% on the first charge
The BM1 Vet's charge IC applies a conservative current limit on an unrecognised cell, which can make the indicator stall at 95–99% for an extended period before terminating. This is the charge IC protecting against overcharge on a cell whose internal resistance profile it hasn't yet logged — not a fault with the battery. Leave the device on charge until the indicator transitions to full and the charge LED changes state. Disconnect, power cycle the unit, and the gauge will display accurately from that point forward.