About this replacement
Jablocom GDP-04 Series — 3.7V Li-ion Replacement Battery (2930277000)
This 3.7V, 1300mAh Li-ion battery replaces the original pack in the Jablocom GDP-04, GDP-04A, and GDP-04D cordless DECT handsets. It matches the OEM voltage, connector, and physical footprint at 63.36 × 31.88 × 6.15mm. When the original cell degrades and the handset drops off mid-call or fails to hold a charge, this pack restores normal operation.
- GDP-04, GDP-04A, GDP-04D compatibility: All three variants share the same battery bay dimensions, connector pinout, and 3.7V charge rail. The BMS accepts the standard Li-ion charge profile the base station delivers — no modification needed across any of these models.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the GDP-04 platform. The BMS triggered protection correctly at low-voltage cutoff and the base station registered a full charge without error flags.
- First-charge protocol for Li-ion cordless handsets: After installing this battery, seat the handset in the base and allow a full uninterrupted charge before first use. Li-ion cells shipped in partial-charge storage state need one complete charge cycle to let the BMS calibrate its capacity tracking accurately.
Talk time shorter than rated after replacing the GDP-04 battery
A freshly installed Li-ion pack can show reduced talk time for the first few cycles. This happens because the BMS ships with a conservative state-of-charge estimate after months of storage at partial capacity. Each full charge-to-discharge cycle lets the BMS recalibrate its internal fuel gauge against the real cell capacity. After three to five complete cycles, the handset's battery indicator and actual talk time should align with the rated 1300mAh output.
GDP-04 handset losing DECT pairing after battery replacement
Removing the battery completely cuts power to the handset's volatile memory, and some DECT phones drop their base station pairing when that happens. The GDP-04 stores pairing data in non-volatile memory, but if the handset shows "searching" or fails to register after the swap, a manual re-pair is needed. Press and hold the registration button on the base station until the indicator flashes, then initiate pairing from the handset menu. The process takes under two minutes and the handset will reconnect at full RF power once paired.