As we know to charge any mobile we need 5V, so for that we have mobile battery of 3.7V & cell of 1.2V it will together produce 4.9V which is sufficient to charge any mobile. Therefore, here we introduce a key size power bank which can charge any mobile where ever you want.
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Step 1: MATERIALS REQUIRED
1 old battery( 3.7V)
1 AA rechargeable cell (1.2V)
connector( charger connector)
switch( micro-slide switch)
lots of wire
Step 2: MAKING
Attach a mobile battery to the rechargeable cell with the help of tape.
Now, we have to attach the wire from '+' terminal of rechargeable cell to the '-' terminal of mobile battery.
Attach the other wire with '+' terminal of mobile battery to the side terminal of the switch.
And then take the other wire & attach it from the middle terminal of switch.(it will be positive line of power bank)
Now, we will take the separate wire which will be attach from '-' terminal of rechargeable cell.( it will be negative line of power bank)
Step 3: FINALLY YOU CAN CHARGE YOUR MOBILE
Take the connector which will consist of two - red line ('+' line) & other line ( '-' line ) . Now , the positive line of power bank made earlier will be attached with the connector carrying positive line & negative line of power bank with negative line of connector.
Step 4: FINAL STEP
Cover the whole material with the tape. You can cover your power bank with any type of box ( either plastic or card board) to make it more attractive.
This device can charge anything which charges with 5V .
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If you have any type of queries regarding it. You can contact me at - firstname.lastname@example.org