Philips EVALIA 5500 Cordless Phone Ni-MH Compatible Battery 3.6V 600mAh

Philips EVALIA 5500 / Xalio 6100 6200 6400 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH replacement battery for the Philips EVALIA 5500 cordless handset and compatible Xalio series phones. It slots into the handset battery compartment and restores the power the handset needs to run the DECT radio and keypad. Capacity matches the original specification at 600mAh (2.16Wh).

• EVALIA 5500 and Xalio 6100 / 6200 / 6400 compatibility: These models share the same 3.6V three-cell Ni-MH battery format, identical connector pitch, and matching physical footprint — no modification needed to fit any handset in this group.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset platform. The BMS accepted the Ni-MH voltage curve without fault codes, and the base station recognised the pack as a valid charge target from the first dock.
• First-charge protocol for Ni-MH handsets: After fitting, seat the handset in the base cradle for a full 16-hour slow charge before using it. Ni-MH cells shipped in storage state need this initial slow charge to reach rated capacity — skipping it leaves the pack underperforming from day one.

Base station showing no charge light after fitting a new Ni-MH pack

Ni-MH batteries lose voltage during storage. If the pack sits below roughly 3.0V when you install it, some DECT base stations will not initiate the charge cycle — they read the voltage as out of range and show no indicator at all. The fix is to seat the handset firmly and leave it undisturbed for 30–60 minutes. The base trickle-feeds enough current to lift the pack voltage above the acceptance threshold, after which normal charging begins. If the light still does not appear, check that the handset contacts are clean and the cradle connection is solid.

Range drops noticeably mid-call after battery swap

A freshly installed or unconditioned Ni-MH pack delivers lower sustained voltage under the RF transmit load of a DECT handset. When voltage sags below the radio's operating floor, the handset drops transmit power — and range shrinks. This is most obvious in the first three to five charge-discharge cycles before the cells reach full capacity. Run the handset through complete cycles — charge fully, use until the low-battery indicator appears, charge again — and range should stabilise by cycle four or five.