KaWe type C Medical Battery 3.7V 4000mAh 12.80120.722

KaWe Type C — 3.7V Li-ion Replacement Battery (12.80120.722)

This 3.7V, 4000mAh lithium-ion cell replaces the original battery in KaWe Type C handheld diagnostic instruments, including otoscopes and ophthalmoscopes used in clinical environments. It cross-references OEM part numbers 12.80120.722, 12.80220.722, and 1S1P ICR 18650A. Voltage and capacity match the original specification exactly.

• Type C platform fit: KaWe's Type C diagnostic instruments share a single-cell 3.7V architecture with a standardised form factor — 108.60 × 24.80 × 24.80mm. The BMS handshake on these devices reads cell impedance at startup, so the replacement cell must sit within the same voltage window as the OEM unit to pass initial verification.
• Bench tested on actual hardware: We cycled this cell through the KaWe Type C power-on sequence and monitored BMS response across charge and discharge. The cell passed voltage threshold checks on the first cycle and held stable output through repeated load events consistent with active diagnostic use.
• Post-installation self-test protocol: After fitting this battery, allow the device to complete its full power-on self-test without interruption. The BMS runs a verification routine at startup — cutting power mid-sequence triggers a false battery fault flag that persists until the next clean reboot from a fully charged state.

Why a KaWe Type C shows a battery fault after a confirmed full charge

The BMS on KaWe Type C devices uses impedance and voltage rise rate to authenticate the cell during the startup self-test. A new cell has higher internal impedance than a conditioned one, which the BMS can misread as a degraded or non-compliant battery. This is not a fault with the replacement cell — it resolves after one complete charge-discharge cycle. Run the device through a full discharge and recharge before returning it to clinical rotation.

Device will not power on after the battery sat unused in storage

Lithium-ion cells self-discharge during storage, and the KaWe Type C BMS will not initiate the startup sequence if cell voltage has dropped below approximately 3.0V — the BMS treats this as a deep-discharge condition and blocks power delivery as a protection measure. Connect the device to its charger and leave it for a minimum of 30 minutes before attempting to power on. This allows the charge IC to bring the cell above the BMS recovery threshold. If the charge indicator remains inactive after 30 minutes, check that the charger output is live before swapping hardware.