Asahi Electric TSA-014 Cordless Phone Replacement Battery 3.6V 700mAh

Asahi Electric TSA-014 / TSC-014 / TSB-014 / THB-014 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH rechargeable battery for Asahi Electric cordless phone handsets. It fits the TSA-014, TSC-014, TSB-014, and THB-014 models. The pack slots directly into the handset battery compartment and connects to the same charging circuit as the original.

• TSA-014 / TSC-014 / TSB-014 / THB-014 compatibility: All four models share the same 3.6V three-cell NiMH configuration, identical connector orientation, and the same base station charging voltage rail — which is why one pack serves the entire range.
• Bench tested on actual hardware: We cycled this pack through the base station charger and confirmed the BMS accepted a full charge without triggering a fault light. Voltage held within spec across three consecutive discharge cycles.
• First-charge protocol for NiMH cordless handsets: After installing, seat the handset in the base for a full 16-hour slow charge before first use. NiMH cells shipped from storage are partially discharged — a short top-up charge will not bring them to rated capacity. Skip this step and the first few talk sessions will feel shorter than expected.

Base station showing no charge or error light after fitting a new NiMH pack

NiMH batteries lose voltage during storage. If the resting voltage drops low enough, some base stations refuse to begin a charge cycle — the charging circuit sees an out-of-range voltage and flags it as a fault. This is not a dead battery or a faulty base. Briefly remove the battery, wait 10 seconds, reinsert it firmly, and reseat the handset in the base. This resets the charge detection circuit and usually clears the error on the first retry.

Handset loses DECT pairing after battery swap

Removing the battery cuts all power to the handset, including the memory that stores the base station pairing code. When you refit the battery, the handset may power on but fail to register with the base. This is normal — it is a power-loss pairing reset, not a hardware fault. Consult your handset manual for the re-registration step; on most Asahi Electric DECT models it involves holding the handset's paging button on the base for three seconds while the handset is powered on.