Maha Powerex Precharged 9V 9.6V 230mAh rechargeable battery

The Powerex 9.6V batteries are designed specifically for devices which need the full 9V to operate. The nominal voltage is 9.6V, whereas most other rechargeable 9V batteries have a nominal voltage of 8.4V. When the Powerex 9.6V is fully charged, the voltage will be around 11.5V, just as your 12V car battery will be around 14.4V when fully charged, and about 7.6V when fully discharged. Due to the non-linear voltage discharge curve of NiMH batteries, the device can access around 90% of the Powerex battery capacity before the voltage drops below 9V.