Cable & Wireless CWR 2200 Replacement Battery 3.6V 700mAh Ni-MH

Cable & Wireless CWR 2200 / CWD 4800 / CWD 5900 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH rechargeable battery for the Cable & Wireless CWR 2200, CWD 4800, and CWD 5900 cordless DECT handsets. It slots into the handset battery compartment and restores power to the cordless phone when the original pack no longer holds a charge. Capacity is 700mAh (2.52Wh) — matching the original specification.

• CWR 2200, CWD 4800, and CWD 5900 compatibility: All three models share the same 3.6V single-cell Ni-MH format and the same battery compartment footprint (45.90 × 31.20 × 10.70mm), so one battery cell type covers the full range.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench. The cell voltage rose steadily to the 3.6V nominal and the base station accepted the charge handshake without fault on each cycle tested.
• First-charge conditioning for Ni-MH: After installing, seat the handset in the base and leave it for a full 16 hours before making calls. Ni-MH cells at storage voltage are below the threshold needed to reach rated capacity — skipping this step leaves you with noticeably reduced talk time from day one.

Talk time shorter than original battery after replacement

A fresh Ni-MH cell ships in a partially discharged state. The first three to five full charge–discharge cycles are conditioning cycles — capacity builds incrementally as the cell's crystalline structure fully activates. Expecting full talk time on the first charge is a common mistake. Run the handset to low battery, return it to the base for a full charge, and repeat this three to five times. By cycle four or five, talk time should reach the rated level.

Base station showing no charge or flashing error light after swap

After storage, a Ni-MH cell can sit below 3.0V — some Cable & Wireless base stations check incoming voltage before enabling the charge circuit, and a cell that reads too low trips a fault state instead of charging normally. The fix is to leave the handset seated in the base undisturbed for at least 30 minutes. The trickle pre-charge stage brings the cell voltage up past the acceptance threshold, at which point the base resumes normal charging and the error light clears.