About this replacement
Motorola DECT 6.0 / IT6 Series — 3.7V Li-Polymer Replacement Battery (61638C / SNN5904A)
This is a 3.7V, 230mAh lithium-polymer battery for Motorola cordless phone handsets. It fits the DECT 6.0, IT6, IT6-2, and Motoactv models. When the original cell degrades and the handset won't hold charge, this is the direct swap to restore the handset without replacing the whole phone.
- DECT 6.0 and IT6 platform fit: These handsets share the same battery bay dimensions, connector orientation, and 3.7V charging circuit. One cell fits all models listed. No adapter needed.
- Bench tested on actual hardware: We cycled this cell through the base station's charge circuit and confirmed the protection IC accepts charge at the standard 4.2V cutoff without triggering an error state on the base unit.
- First charge after installation: Li-polymer cells ship partially charged for transport safety. After installing, seat the handset in the base and let it charge uninterrupted until the charge indicator clears — this allows the cell to reach rated capacity from a stable, controlled charge cycle.
Talk time shorter than expected after battery swap
A new li-polymer cell at 230mAh won't always perform to rated capacity on the first cycle. The cell needs two to three full charge-and-discharge cycles before the electrodes stabilise and capacity reaches its rated level. If talk time is still noticeably short after three cycles, check that the handset is fully seated in the cradle — a loose connection means the base charges at a reduced current or not at all. The charge LED on the base is the clearest indicator: steady means full contact, flashing or absent means reseat the handset.
Handset not pairing with base after battery replacement
Removing the battery on some DECT phones clears the handset's registration with the base. The handset powers up but shows no line or fails to ring. To re-pair, hold the page/find button on the base for five seconds until the base beeps, then follow the handset's registration prompt — usually accessed under Settings or by holding a softkey. Once registered, the handset stores the pairing in non-volatile memory and won't lose it again from normal battery swaps.