ADEEPT RaspRover User Manual page 14

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5. Put two 18650 batteries in 18650 Battery Holder Set according to the following method.
Take out 1 ribbons and 1 batteries.
Roll one end of the ribbon to let through a battery and fix.
Insert the batteries into the rings - ribbon closer to the anode.
Install the batteries into the holder based on the pole.
To remove the batteries, just pull the ribbon and take them out.
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