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Charging a phone battery

Karthik rajagopal

May 9, 2016
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Hi all,
I recently got a Samsung phone battery from my damaged phone. The battery works well but I don't know how to charge it without my phone. I got a battery charger from my power bank which delivers 4.2v. I am not sure whether it is safe to use this. I have enclosed the images of both my battery and the charger module. If it is safe , plz also mention the way I must connect it.
Thanks in advance.
 

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Externet

Aug 24, 2009
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Determine which terminal is positive if not marked; apply +4.00 Volts and no more to it, and minus to (-) for a couple of hours.
 

Karthik rajagopal

May 9, 2016
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Determine which terminal is positive if not marked; apply +4.00 Volts and no more to it, and minus to (-) for a couple of hours.
Thank you. Here is the imagine of my module and the battery. If you can,plz help me to know whether the module is safe to use, being a LiPo battery I dont want to take risk.
Thank you .
 

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Chemelec

Jul 12, 2016
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These batteries usually have more than 2 Terminals on them, some of the terminals are for protection against Over Charging and Over Heating. PREVENTS FIRE or EXPLOSION.
So they should be charged with a Proper Charger designed for them.
 

Harald Kapp

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Phone batteries usually have more than 2 terminals. 3, 4 or more are used for various purposes like e,g, temperature sending, indication of battery size or even integrated battery management.
While it may work charging the battery using only the "+" and "-" terminals, I personally consider this not safe unless you take additional (external) measures to monitor the battery (voltage, temperature) and to keep charge current to within safe limits.
 

Karthik rajagopal

May 9, 2016
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These batteries usually have more than 2 Terminals on them, some of the terminals are for protection against Over Charging and Over Heating. PREVENTS FIRE or EXPLOSION.
So they should be charged with a Proper Charger designed for them.
Thank you for the reply.My battery has 3 terminals on it. How to find out whether my module has an over discharge and charge protection?
 

BobK

Jan 5, 2010
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Will it charge in the damaged phone?

Bob
 

Externet

Aug 24, 2009
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Check if there is (+), (-) polarity markings in the phone.
 

Karthik rajagopal

May 9, 2016
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Phone batteries usually have more than 2 terminals. 3, 4 or more are used for various purposes like e,g, temperature sending, indication of battery size or even integrated battery management.
While it may work charging the battery using only the "+" and "-" terminals, I personally consider this not safe unless you take additional (external) measures to monitor the battery (voltage, temperature) and to keep charge current to within safe limits.
Thank you for the reply. I was also concerned about the safety as I dont know much about rechargeable ones. I thought that it was safe as I took the charging module from a power bank but not sure whether it has a cut off feature. Is there any other alternate ways of charging it?
 

Karthik rajagopal

May 9, 2016
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Arrow terminal appears to be the bti , other 2 are marked on top.
However, correct charger must be used not just everyday power supply.

As others say, charge it in the phone.



Appears to be a cheap one on Ebay.......

https://www.ebay.com.au/itm/Battery...0-EB494358VU/180963350180?hash=item2a224196a4

bit over $5.00
Thank you for suggesting me this product. This can be a better alternative for charging these batteries but I wanted the charger to be small so that I can mount them in the enclosure of my portable projects.
 

Externet

Aug 24, 2009
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Then use that LiPo charging board you prefer for your phone 'battery' , which is not a battery, it is a single cell, and find out your way to mate the contacts.
If you have the leftovers of your damaged phone, cut off and use its plastic craddle with proper contacts installed inside your project, that will accept/lodge it securely
 
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