Formerly Kirk 50 Cordless Phone Replacement Battery 3.6V 700mAh

Formerly KIRK 50 / KIRK 60 / KIRK 70 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH battery for the Formerly KIRK 50, KIRK 60, and KIRK 70 cordless DECT handsets. It replaces the original cell pack that powers the handset during calls and standby. When the stock battery no longer holds a charge, this cell restores normal handset operation.

• KIRK 50, 60, and 70 compatibility: All three models share the same 3.6V single-cell Ni-MH voltage rail, physical footprint (45.00 × 31.10 × 10.50mm), and connector orientation — so one cell pack fits the full KIRK family without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset platform. The BMS held charge acceptance within spec and the cell reached rated capacity by the third conditioning cycle.
• First-charge protocol for Ni-MH handsets: After installing, seat the handset in the base for a continuous 16-hour charge before first use. Ni-MH chemistry in cordless phones requires this slow initial charge to condition the cells and reach the rated 700mAh capacity — skipping it shortens talk time from the first session.

Base station charge light not activating on a new Ni-MH pack

DECT bases use a voltage threshold — typically around 3.0V — to detect a valid battery before starting the charge cycle. A new Ni-MH pack that has been in storage can self-discharge below this threshold, causing the base to show no charge activity or an error light. The fix is a short trickle charge: some bases will retry automatically after a few minutes, but if yours does not, remove and reinsert the handset firmly to trigger a fresh detection poll. If the base still shows no activity after 10 minutes, check that the handset contacts are clean and making solid contact with the cradle pins.

Range drops mid-call after fitting a replacement battery

The KIRK handsets boost RF transmit power during calls, and that draw causes the cell voltage to sag if the Ni-MH pack is not yet fully conditioned. A partially conditioned cell may read adequate voltage at rest but drop below the transmit-power threshold under RF load, causing the handset to reduce range or drop the call. This is not a fault with the cell — it corrects itself after three to five full charge-discharge cycles. Complete each cycle fully: charge in the base until the charge light clears, then use the handset until the low-battery indicator appears before reseating it.