Innovaphone IP61 Replacement Battery 3.7V 650mAh Li-ion

Innovaphone IP61 / IP64 — 3.7V Li-ion Replacement Battery

This 3.7V 650mAh Li-ion battery fits the Innovaphone IP61 and IP64 cordless DECT handsets. It slots into the battery compartment on the rear of the handset and restores full operational capacity to handsets where the original cell has degraded. Voltage and form factor match OEM spec at 47.00 × 34.00 × 4.60mm.

• IP61 and IP64 platform fit: Both models share the same handset chassis, battery bay dimensions, and 3.7V supply rail, which is why a single cell covers both. The connector orientation and BMS communication protocol are identical across the pair.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the IP61 handset. The BMS accepted charge from the base station without error flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no thermal events observed.
• First charge after installation: Place the handset in the base immediately after fitting this battery and leave it there for a full 16 hours before first use. Li-ion cells shipped in storage state need a full slow charge to initialise the BMS accurately and reach rated capacity from the first cycle.

Talk time shorter than the original battery after replacement

A new Li-ion cell often under-delivers capacity on the first two or three cycles because the BMS has not yet calibrated its charge endpoint to this specific cell. The base station charger reads the cell voltage and terminates charge based on delta-V, and a new cell can trigger early termination before it is genuinely full. Run three full charge-to-depletion cycles — letting the handset run until it powers down, then placing it back in the base for a full 16-hour charge — and rated capacity should stabilise. If talk time is still short after five cycles, check the base station contacts are clean and making solid contact.

Base station shows no charge light or error indication on new battery

Replacement Li-ion cells often ship at a storage charge level around 3.0V to 3.2V — below the threshold some DECT base stations require before they will begin a charge cycle. The base may show no indicator, a flashing error, or simply do nothing. Remove the handset, leave it in the base for 30 minutes anyway — most Innovaphone base stations will trickle charge at low voltage before switching to full charge mode. If the charge light still does not appear after 30 minutes, check that the handset is seated flush so all three charging contacts are touching the base pins.