The NP-Bk1 Lithium-Ion Battery Pack from Pearstone is designed to replace the Sony NP-BK1 battery. Small and lightweight, Lithium-Ion batteries can be charged or discharged at any time without developing memory effects.
| Chemistry | Lithium-Ion |
| Output Voltage | 3.7V |
| Capacity | 825mAh |
| Dimensions | 1.4 x 0.3 x 1.6" (34 x 7 x 40mm) |
| Weight | 0.7 oz (20g) |