About this replacement
Battery Pack 1IRC19/65 2600 XH2.54 — 3.7V Li-ion Replacement Battery
This is a 3.7V, 2600mAh (9.62Wh) lithium-ion cell pack with an XH2.54 connector. It replaces the OEM pack rated 1IRC19/65 2600 XH2.54 in portable electronics that use this connector standard. The cell format is 18650-class at 65.80 × 21.00 × 18.50mm.
- XH2.54 connector compatibility: The XH2.54 two-pin interface is a standard pitch used across compact portable devices. The connector mates directly with OEM socket geometry — no adapter required and no re-pinning. Verify your existing pack uses XH2.54 before ordering, as similar-looking connectors like PH2.0 are not interchangeable.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench. The BMS held cutoff at the correct thresholds at both ends of the voltage curve, and the cell voltage at rest settled at storage voltage prior to shipping.
- First-cycle calibration: If your device shows a fuel gauge or capacity indicator, run one full charge-to-discharge cycle after installation. New cells arrive at storage voltage, and the gauge IC needs one full cycle against the fresh cells to report capacity accurately.
Pack running below 3.7V on first use
Replacement packs ship at storage voltage — typically 3.6V to 3.85V — not at full charge. This is intentional for safe transport and cell longevity during storage. On first installation, the device may read a low state-of-charge and behave as if the battery is nearly flat. Charge the pack fully before use; rated 3.7V nominal reflects the cell chemistry midpoint, not the delivery voltage.
Pack not reaching full charge on the first cycle
Some charge ICs apply a reduced current on the first cycle when they detect a new or recently depleted cell — this is a conditioning behaviour, not a fault. The pack may terminate charge slightly below expected capacity on cycle one. Leave it connected through a full uninterrupted charge on the second cycle. By cycle two or three, the charge IC will have profiled the cells and capacity will reach its rated 2600mAh.