BORETTI BBA92 Notice D'utilisation page 11

To prevent accidental activation of the device, which could cause serious
injury, we recommend that you always remove the battery before making
any changes to the device.
Warning
Always remove the battery from the device when modifying,
maintaining, cleaning, assembling or not using the device.
3.7 How to disconnect the battery
1. Turn off the device completely.
2. Press the two 'buttons' on either side of the battery.
3. Pull the battery from the device.
To install the battery, follow the above steps in reverse order.
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