In this instructable we are going to see how to make a power bank out of AA batteries
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Step 1: Things Required
- battery box
- AA battery
- OTG cable
- USB charging cable
solder the battery holders together to form a 4AA size holder
Then solder the battery box with OTG cable
Now place the battery on the battery box
Now connect the phone with the USB cable
.Then you can able to see the phone is charging