About this replacement
Custom Battery Pack YBT-6C — 3.7V Li-ion Replacement Battery
This is a 3.7V, 1100mAh Li-ion replacement pack built to OEM part number YBT-6C. It measures 53.30 × 34.00 × 6.50mm — a compact cell format used in a range of rechargeable electronics. Fit model is unspecified, so confirm your original pack carries part number YBT-6C before ordering.
- YBT-6C form factor: This pack matches the original cell dimensions and voltage rail at 3.7V nominal. Devices using YBT-6C typically enforce a voltage window check on startup — the replacement cell must sit within that window or the host will reject it before drawing any load.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on a cell analyser. The BMS held cutoff at the correct low-voltage threshold and accepted a full charge to 4.2V without triggering protection. Capacity measured within spec at 1100mAh on the second cycle.
- First-cycle calibration: If your device has an integrated fuel gauge, run one complete charge-discharge cycle immediately after install. The gauge IC recalibrates its state-of-charge model against the new cells — skipping this step causes the indicator to read inaccurately until a full cycle completes.
Pack not reaching full charge on the first cycle
New Li-ion cells often ship at storage voltage — typically 3.6V to 3.8V — rather than full charge. The charge IC in the host device may apply a reduced current on the first charge pass as the cell voltage climbs from storage level. This is a normal conditioning behaviour and not a fault. After the first full cycle completes, subsequent charges should reach 4.2V and hold capacity correctly.
Device rejecting the pack immediately after swap
Some devices that use the YBT-6C format run a voltage range check or firmware authentication handshake at power-on. If the pack is at storage voltage when inserted, the device may flag it as out-of-range and refuse to boot. Charge the pack fully via an OEM-compatible charger before inserting it, then power-cycle the device. If rejection persists after a full charge, verify the replacement part number matches YBT-6C exactly.