ZTE WP826 Replacement Battery Ni3612T30P3S534416 3.6V 1200mAh

ZTE WP826 Series — 3.6V Ni-MH Replacement Battery (Ni3612T30P3S534416)

This is a 3.6V, 1200mAh Ni-MH battery for ZTE cordless handsets using part number Ni3612T30P3S534416. It fits the WP826, WP822, WP833, and WP612, among others. All share the same voltage rail, connector, and charge-acceptance profile from the base station.

• WP826 / WP822 / WP833 / WP612 platform fit: These handsets run the same 3.6V single-cell Ni-MH circuit with a shared connector pinout. The base station charges via the same contact arrangement across all models, so one pack covers the full range.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on WP826 hardware. The BMS accepted charge normally from the base station contacts, and the handset's charge indicator cleared without fault codes.
• First-charge protocol for Ni-MH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells ship in a partially discharged state — a slow, uninterrupted first charge lets them reach rated 1200mAh capacity. Skipping this step causes the first few cycles to run short.

Base station charge light not activating on a fresh Ni-MH pack

ZTE base stations check the incoming cell voltage before starting a charge cycle. A new Ni-MH pack that has sat in storage can drop to 3.0V or below — low enough that the base interprets it as a fault rather than a depleted cell. The fix is to briefly power the handset on and off, which draws just enough current to shift the BMS out of its low-voltage hold state. After that, reseat the handset firmly in the base — the charge contact must make clean connection on all three pins for the indicator to activate.

Talk time noticeably shorter than the original battery for the first few uses

Ni-MH cells don't deliver full capacity straight out of the box. The electrodes need three to five complete charge-discharge cycles before the chemical structure stabilises and capacity reaches the rated 1200mAh. If talk time improves cycle by cycle, the pack is conditioning normally — not faulty. To accelerate this, use the handset until the low-battery alert sounds, return it to the base for a full uninterrupted charge, and repeat. By cycle five, capacity should be at or near the 4.32Wh rated figure.