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modifying a mobile charger? Answered

hello,

i have an old 2000mAh phone charger which i played with, it was supplying 3.5V.. i removed the battery and replaced it with 4 18650 batteries rated at 3000mAh each.. all are connected in parallel.. will this give me in theory 12000mAh battery?

also, is it dangerous to use it or do i need to add any current limiter resistors to reduce the current..


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Yonatan24
Yonatan24

5 years ago

1. You obviously need an up converter to 5 volts so it will be able to charge your phone

When you higher the voltage you can't have the same amount of amps, To get to 5 volts from 3 volts you need to multiply by about 1.7, this means you'll have 1.7 times less amps, also your up converter probably isn't very efficient so you can subtact another 10-30℅ to get your total which is about 6000 mah in total, this should definitely charge your phone a couple times to 100℅.

I hope this helped you! :)

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iceng
iceng

5 years ago

Yes, they are now one 12000mAh battery.

It Is Not Dangerous to add extra battery time to operate your phone.

A limiting resistor is not necessary if the current ability is increased and the voltage stays the same 3.8 volts.

Any battery can be accidentally shorted and pop.... Four (4) batteries mishandled can start a fire if shorted by a metal screwdriver !!

You may have an issue with the present phone charger because it will certainly take longer to charge a 12000mAh battery BUT the charger may overheat and fail on the extra charging load..

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pucksurfer
pucksurfer

5 years ago

Yes, I believe that it will make a 12000 mah battery. And, what is "dangerous"? dangerous for a person, dangerous for your phone (i'm assuming)?

I think it might be dangerous for a phone... I would buy a little lipo charger off ebay or something and then hook that up to it