SBC 3.6V Cordless Phone Compatible Battery SBC302H 1200mAh

SBC SBC302H — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1200mAh Ni-MH replacement battery for the SBC SBC302H cordless phone handset. It slots into the handset battery compartment and restores full talk and standby operation. Voltage and cell count match the original pack exactly.

• SBC302H handset fit: The SBC302H uses a single 3.6V Ni-MH cell block with a specific footprint — 50.43 x 42.54 x 14.40mm. This pack matches those dimensions and the voltage rail the base station charges against. No modification needed.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the bench. The BMS held steady across each cycle and the cell voltage climbed normally through the conditioning phase without dropping off under standby draw.
• First-charge protocol for Ni-MH cordless packs: After installing, seat the handset in the base for a full 16-hour charge before first use. Ni-MH cells in cordless phones ship partially discharged. A slow first charge lets the cells reach rated capacity — skipping it means the first few cycles will underperform.

Talk time shorter than expected after fitting a new pack

Ni-MH cells do not deliver full rated capacity on the first charge cycle. The SBC302H handset draws a consistent current during calls, and a partially conditioned pack will hit the low-voltage cutoff sooner. This is normal — not a defective battery. Capacity builds over three to five full charge and discharge cycles, after which the pack stabilises near its rated 1200mAh.

Base station not registering charge on a freshly installed pack

Ni-MH packs sitting in storage self-discharge slowly and can drop below the voltage the base station expects before it begins a charge cycle. If the charge indicator stays off or shows an error, remove the handset, leave it out for 30 seconds, then reseat it firmly. If the base still does not respond, check the terminal contacts on the handset for debris — the base reads voltage through those pins before committing to a charge. A clean contact and a firm seat in the cradle is usually enough to trigger the charge cycle.