The NP-20 Lithium-Ion Battery Pack from Pearstone is designed to replace the Casio NP-20 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 | 600mAh |
| Dimensions | 4.4 x 0.9 x 2.3" (112 x 24 x 58mm) |
| Weight | 0.56 oz (16g) |