Axion STIM-PRO Comfort Manuel D'instructions page 23

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BATTERY RECHARGING
When the low battery indicator is shown, the battery needs
to be replaced. Remove the battery if the device is not likely
to be used for some time.
Make sure the power is off.
Open the battery compartment (push the cover downwards)
Remove the battery
Insert the new battery. Please check that the polarity is
correct!
Close the battery compartment
STIM-PRO Comfort
EN
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