The high-capacity Pearstone BP-31 Rechargeable Lithium-Ion Battery is designed to replace the Sigma BP-31 battery. It is compatible with the Sigma DP-1 Digital Camera, and features Lithium technology, which ensures maximum battery life and maximum power. It also features No Memory Effect that lets you recharge partially drained batteries without reducing performance.
| Chemistry | Lithium-ion |
| Capacity | 900mAh |
| Output Voltage | 3.7v |
| Dimensions | 1.7 x 1.4 x 0.5" |
| Weight | Not Specified by Manufacturer |