The 3.6V, 1000mAh Pearstone LI-90B Lithium-Ion Battery Pack replaces the Olympus LI-90B battery for use with the TG-1 iHS and TG-2 iHS digital cameras. Lithium-ion batteries can be charged or discharged at any time without developing memory effect, meaning it will not lose its ability to hold a full charge.
| Chemistry | Lithium-ion |
| Capacity | 1000 mAh |
| Output Voltage | 3.6 V |
| Dimensions | 1.3 x 1.56 x 0.33" / 33 x 39.6 x 8.4 mm |
| Weight | 0.8 oz / 22.7 g |