First, buy a circuit board, a 5V mobile power boost board with an output current of 1.5A, an efficiency of 86%, and lithium battery protection. Buy it on Taobao for 13.00, excluding shipping
Remove a USB modem for the shell (made of aluminum alloy)
Fix the circuit board on the plastic plate. In order to fix it to the outer shell, the plastic plate is inserted into the groove of the outer shell.
Modify the panel, line it with plastic sheet, and cut out the corresponding holes. The other side does not need to be modified.
What it looks like when charging (red light on, green light on when fully charged)
When discharging (charging a mobile phone), the blue light is on
Put it in your hand
Finally, the test results are given:
(I tested it during my trip to Guilin. I put it in my pocket during the security check at the train station. The security officer scanned my whole body with a metal detector and then pinched my pocket. There was no problem.)
The battery pack is an old 18650 battery from a disassembled Toshiba laptop.
Charging phone: HTC TOUCH PRO has a battery capacity of 1340mAh and can be charged 1.5 times (that is, it can be fully charged the first time, and can only be charged to 50% the second time)
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