Switel DFT 8172 Replacement Battery 2.4V 600mAh Ni-MH

Switel DFT 8172 / DFT 8171 / DFT 8173 / DF 812 — 2.4V Ni-MH Replacement Battery

This is a 2.4V 600mAh Ni-MH rechargeable battery for Switel cordless DECT handsets. It fits the DFT 8172, DFT 8171, DFT 8173, and DF 812 series. The cell dimensions are 35.40 × 32.50 × 6.70mm — measure your original before installing if you are unsure.

• DFT / DF 812 platform compatibility: These handsets share the same 2.4V two-cell NiMH pack format and connector orientation. The base station charges via the same contact rail across all listed models, so one pack fits the full range without any wiring changes.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a NiMH-capable analyser. The cells reached 600mAh at rated capacity after three conditioning cycles. The protection circuit held cutoff voltage correctly at both ends of the charge window.
• 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 in cordless phones need a slow initial charge to align cell capacity across both cells in the pack — skipping this shortens the usable charge window from the first week.

Base station showing no charge light on a new NiMH pack

A NiMH pack that has been in storage can drop below 2.0V total — the Switel base station expects to see a minimum voltage before it begins the charge cycle. Below that threshold, the base interprets the pack as absent or faulty and the charge indicator stays off. The fix is a slow trickle charge: some universal NiMH chargers can force a recovery charge at low current (around 50–100mA) until voltage climbs back above 2.2V. Once the pack clears that floor, reseat the handset and the base station should recognise it and resume normal charging.

Handset losing range shortly after a battery swap

DECT transmit circuits on these handsets draw a short current spike when the RF module is active. A NiMH pack that has not been fully conditioned yet has higher internal resistance, which causes voltage to sag under that load. When the voltage sags far enough, the RF output drops and the handset struggles to hold the base station link at distance. Run three full charge-and-use cycles first — internal resistance falls as the cells condition — and check that resting voltage sits at or above 2.4V before each session.