About this replacement
BioControl MVP ICON 78300 — 3.7V Li-ion Replacement Battery (78131)
This is a 3.7V, 3400mAh Li-ion replacement for the BioControl Part No. 78131 battery. It fits the BioControl 78300BC — specifically the MVP ICON 78300 version only. Confirm your model before ordering; other 78300 variants use a different cell configuration.
- MVP ICON 78300 compatibility: The MVP ICON 78300 uses a single-cell 3.7V rail with a connector and BMS handshake matched to the 78131 spec. Other 78300 variants may share the housing but run a different BMS protocol — this cell will not pass their self-test.
- Bench tested on actual hardware: We cycled this cell through the MVP ICON 78300's charge IC and monitored BMS communication at each stage. The protection circuit responded correctly to charge termination and low-voltage cutoff. No false fault codes were logged.
- Post-swap startup sequence: After installing this cell, let the device complete its full power-on self-test without interruption. The BMS runs a verification pass at startup — cutting power during this window logs a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
The MVP ICON 78300 runs a BMS learn cycle on first boot with a new cell. If the device stalls mid-sequence or restarts itself, the charge IC has not yet profiled the new cell's internal resistance. This is expected on the first one to three cycles. Let the device boot fully, run one complete charge-discharge cycle, and the boot sequence will stabilise.
Charge indicator not reaching 100% on the first charge
On a new cell, the charge IC applies a conservative upper voltage limit until it confirms the cell is within expected parameters. This means the indicator may plateau at 90–95% on the first charge. The device is not faulty. Run one full charge to termination, discharge under normal use, then charge again — the IC recalibrates and the indicator will read correctly. Target full charge terminates at 4.20V.