Siemens Gigaset 3000 Micro Replacement Battery T347 3.6V 500mAh

Siemens Gigaset 3000 / 3010 / 3015 Micro — 3.6V Ni-MH Replacement Battery (T347)

This is a 3.6V, 500mAh Ni-MH battery pack for the Siemens Gigaset 3000 Micro, 3010 Micro, and 3015 Micro cordless handsets. It replaces OEM part numbers T347, NS3109, 3QNF3550, and V30145-K1310-X143. When the original cell degrades and talk time collapses, this pack restores the handset to normal operation.

• Gigaset 3000 / 3010 / 3015 Micro compatibility: These three handsets share the same battery bay geometry, connector orientation, and 3.6V NiMH charging circuit. The base station charges through the same contact pins across all three variants, so one pack covers the whole range without modification.
• Bench tested on actual hardware: We cycled this pack through the Gigaset base station charging circuit and confirmed the BMS accepted charge without triggering an error light. Cell voltage at full charge measured within the expected 4.3–4.5V range for a three-cell NiMH pack.
• First-charge protocol for NiMH handsets: After fitting this pack, seat the handset in the base cradle for a full 16 hours before using it. NiMH cells shipped in storage state need a slow, uninterrupted first charge to reach rated capacity — cutting this short leaves you with a fraction of the 500mAh the pack is rated for.

Why range drops on the Gigaset Micro after a battery swap

DECT transmit power on the Gigaset 3000 series is drawn directly from the battery rail. When a NiMH pack is partially conditioned or has shallow-cycled into capacity fade, its voltage sags under the RF transmit burst — typically dropping below 3.3V mid-call. The handset's transmitter reduces output power under that threshold, which shrinks the usable range even if the battery indicator still shows charge. Running three full charge-discharge cycles through the base station after fitting a new pack brings the cells to full electrochemical capacity and stabilises the voltage rail under RF load.

Base station shows no charge or error light after fitting new pack

NiMH packs can leave the warehouse at a low resting voltage — sometimes below 3.0V — after extended storage. Some Gigaset base stations read that voltage as a fault condition and refuse to initiate a charge cycle. Remove the handset, leave it off the base for 30 seconds, then reseat it firmly so both charging contacts are flush. If the error light persists, check the contact pins on the handset for dirt or oxidation and clean them with a dry cloth — the base expects a minimum contact resistance to begin the charge handshake.