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charging one battery with another battery

i want to make a project about battery charger.i want to know if a battery can be charged using another battery of same specification.
please help me

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MattS291 year ago

You can, but it requires a circuit called a "Boost Converter" to raise the voltage of the battery you are charging off of. To charge, batteries always need a slightly higher voltage that what they are rated to produce. Example: If a battery is rated at 12V, it will require ~14V to charge. Check Wiki for "Boost Converter" and "Joule Thief" (a simple DIY boost circuit).

what do want to do that for when you have a battery of the specification?
sampath_o2 (author)  freakyqwerty6 years ago
freakyqwerty thaks for the reply.i want to charge because all the companies cell phones work at same voltage but they cant fit into all the phones.thats why
Oh right, i never thougt of that
kelseymh6 years ago
No, you can't. In order to charge a battery, you need to apply a reverse bias that is larger than the battery's normal forward bias. What you're describing is essentially a short circuit. Both batteries will overheat, and either leak or explode depending on how they're constructed. If you try it, please make sure you write up an Instructable after you're released from the hospital.
sampath_o2 (author)  kelseymh6 years ago
kelseymh we can connect another battery in parallel to increase the voltage.can we charge battery this way?
sampath_o2 (author) 6 years ago
thanks for replies friends.
kelseymh we can connect another battery in parallel to increase the voltage.can we charge battery this way?