About this replacement
Custom Battery Pack 1ICP/7/34/48 1S1P — 3.7V Li-ion Replacement Battery
This is a 3.7V 1300mAh (4.81Wh) single-cell Li-ion pack built to the 1ICP/7/34/48 1S1P cell specification. It is a compact OEM-format battery measuring 48.60 × 36.04 × 7.40 mm. Use it to replace a depleted original pack in any device that accepts this cell format and voltage range.
- Single-cell 1S1P format: This pack runs one cell in a single parallel configuration. That means the output voltage sits at a nominal 3.7V with a full-charge ceiling near 4.2V and a low-cutoff threshold around 3.0V — standard Li-ion rails that the device's charge IC and protection circuit are built around.
- Bench tested on actual hardware: We cycled this pack on a cell analyser and confirmed the BMS trips at the correct over-discharge cutoff. Charge acceptance was clean from the first cycle, with no anomalous current draw at the top-of-charge taper stage.
- First-cycle calibration tip: If your device has an integrated fuel gauge, run one complete charge-to-discharge cycle after swapping this pack in. The fuel gauge learns cell capacity against real charge throughput — skipping this step can leave the indicator reading inaccurately for weeks.
Pack running at lower voltage than rated on first install
Li-ion cells ship at storage voltage — typically 3.6V to 3.85V — not at full charge. If your device reports low battery or behaves sluggishly immediately after swapping this pack in, that is the expected state of a freshly shipped cell. The device's charge IC has not yet had a chance to bring the pack up to 4.2V. Charge fully before drawing any load, then assess capacity from that baseline.
Pack not reaching full charge on the first cycle
Some charge ICs apply a reduced pre-charge current when they detect a new or cold cell pack for the first time — this is a safety behaviour, not a fault. The charge session may terminate earlier than expected or the capacity indicator may read lower than the 1300mAh rating. This typically clears after one full charge-discharge cycle as the IC builds confidence in the cell's internal resistance profile. If the pack still cuts short after two full cycles, check that the charger output voltage is within the device's specified input range.