The Olympus BLS-5 Lithium-Ion Rechargeable Battery is designed to work in the PEN E-PL2 camera, and possible future models. The BLS-5 can only be charged using the Olympus BCS-5 Battery Charger
| Chemistry | Lithium-ion |
| Capacity | 1150 mAh Minimum: 1080 mAh |
| Output Voltage | 7.2 V |
| Dimensions | Not specified by manufacturer |
| Weight | Not specified by manufacturer |