The NP-40 Lithium-Ion Battery Pack from Pearstone is designed to replace the Casio NP-40 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 | 1000mAh |
| Dimensions | 1.5 x 1.5 x 0.4" (38 x 38 x 10mm) |
| Weight | 1.1 oz (31g) |