NEC 2G4 Cordless Phone Compatible Battery 3.6V 700mAh

NEC 2G4 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH battery for the NEC 2G4 cordless phone handset. It replaces the original pack when the handset no longer holds a charge or drops calls mid-conversation. Dimensions are 45.00 × 31.10 × 10.50mm — check these against your existing pack before ordering.

• NEC 2G4 handset fit: The 2G4 uses a compact single-cell Ni-MH pack running at 3.6V nominal. The base station's charging circuit is tuned to this voltage and chemistry — swapping to a different cell count or chemistry will cause charging errors or damage the charging contacts.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a NiMH-compatible analyser. The BMS accepted full charge without thermal cutoff, and capacity readings stabilised after three conditioning cycles.
• First-charge protocol for NiMH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells at storage charge won't reach rated capacity on a short top-up — the slow first charge activates the full 700mAh across all cells.

Base station charge light not activating on a new NiMH pack

NiMH batteries lose voltage during storage. If the pack voltage drops low enough, the NEC 2G4 base station's charge detection circuit may not register a valid battery and the charge indicator won't light. The fix is straightforward: leave the handset seated in the base undisturbed. Most base stations will begin a trickle charge within 10–15 minutes once the circuit detects a minimum threshold — typically around 3.0V. If the light still doesn't activate after 30 minutes, remove and reseat the handset firmly to ensure contact.

Talk time shorter than expected after replacement

A new NiMH pack rarely delivers full rated capacity on the first cycle. The cells need 3 to 5 full charge-discharge cycles before reaching the rated 700mAh. If talk time is noticeably short after the first few uses, run the handset until it signals low battery, then return it to the base for a complete 16-hour charge. Capacity increases measurably with each cycle. By cycle five, output should be close to rated spec.