About this replacement
KaWe Type C — 3.7V Li-ion Replacement Battery (12.80120.722)
This 3.7V, 2600mAh lithium-ion battery replaces the original cell in KaWe Type C handheld clinical examination instruments. It fits devices referenced under OEM part numbers 12.80120.722 and 12.80220.722. The cell dimensions are 108.60 × 24.80 × 24.80mm — confirm these against your existing battery before fitting.
- Type C instrument compatibility: KaWe Type C otoscopes and diagnostic handpieces share a common 3.7V single-cell architecture. The BMS on these devices authenticates cell voltage at startup, so the replacement must present a nominal 3.7V rail at power-on or the device will register a fault before the first exam.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles on KaWe-compatible test rigs. The BMS completed its initialisation handshake cleanly and passed voltage threshold checks without triggering a fault state.
- Post-swap startup protocol: After fitting this battery, allow the device to complete its full power-on self-test without pressing any buttons or cycling power. Medical-grade BMS firmware runs a voltage verification sequence at boot — interrupting it logs a false battery fault that persists until the next clean reboot.
Device not completing boot sequence on a new battery
KaWe Type C instruments run a BMS learn cycle on first use. A fresh cell that has partially self-discharged in storage may present a voltage slightly below the device's boot threshold, causing the startup sequence to stall or abort. This is not a faulty battery — it is the device rejecting an unverified cell. Connect the device to its charger for a full charge cycle first, then power on. After one complete charge-discharge cycle, the BMS accepts the cell and boot completes normally.
Charge indicator not reaching 100% on the first charge
On the first charge after a swap, the device's charge IC applies a conservative current limit to an uncharacterised cell. This causes the indicator to plateau below 100% and stop climbing. The cell is not defective — the charge IC has simply not yet mapped the cell's internal resistance profile. Run one full charge to cutoff, use the device until it prompts for charge, then charge again. The second cycle typically completes to 100% without stalling.