BBM supplies the Seiko MS421R IV03E Battery. This Rechargeable Lithium Coin Cell comes complete with solder tabs for soldering directly to your device.
MS421R IV03E Battery Specifications:
Chemistry - Rechargeable Lithium
Voltage - 3V
Capacity - 1.5mAh
Dimensions - 4.8mm x 2.36mm
Operation Temp - -20 to +60C
BIN ML-9