Battery question for the pros out there

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scalewiz

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Feb 17, 2011
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Lithium batteries will measure more than this. When they come off the charger they should measure somewhere around 4 to 4.2 volts. If you are able to measure 1.5 volts, then that battery should have shut down, assuming it is a protected battery. If it is not a protected battery, be careful. A lithium battery should not be discharged that low! If you are unable to measure a voltage that is closer to normal, the battery should be replaced (I assume the charger is good). Contact the vendor you obtained the battery from for further instructions or to obtain replacements.

Also, be sure it is a lithium battery you are testing. If your mod was designed to use NiMh batteries, then this will be considered a normal voltage. Lithium batteries 3.7-4.2 volts, NiMh batteries, 1.0 to 1.4 volts.
 

scalewiz

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Feb 17, 2011
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Charge 'em, and then measure 'em. Any battery that won't measure up to the proper voltage should not be used and needs replaced. Another tip; measure the battery voltage. Then insert it in the charger. Take your meter leads and measure the voltage across the battery while charging. Naturally, this level should be higher, and will rise as the battery charges. If the voltage reading is still low while the battery is charging, then the charger is probably bad.

If the battery off the charger is not able to measure up to at least 2.5 volts, then the protection circuit inside the battery should cut off the battery and prevent it from discharging any further. This is done to protect you and the battery from self destruction. If the battery cannot charge to this level, then it MUST be replaced. Also, any battery that charges up and then quickly loses the charge is probably defective.

Do different batteries work in your mod? If so, then replace the suspect ones.
 

skullfreak

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Charge 'em, and then measure 'em. Any battery that won't measure up to the proper voltage should not be used and needs replaced. Another tip; measure the battery voltage. Then insert it in the charger. Take your meter leads and measure the voltage across the battery while charging. Naturally, this level should be higher, and will rise as the battery charges. If the voltage reading is still low while the battery is charging, then the charger is probably bad.

If the battery off the charger is not able to measure up to at least 2.5 volts, then the protection circuit inside the battery should cut off the battery and prevent it from discharging any further. This is done to protect you and the battery from self destruction. If the battery cannot charge to this level, then it MUST be replaced. Also, any battery that charges up and then quickly loses the charge is probably defective.

Do different batteries work in your mod? If so, then replace the suspect ones.


thx bud good info
 

Switched

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Feb 18, 2010
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A battery that has been discharged past its low voltage threshold of 2.5V = toast and dangerous to bring back to life without the proper equip (cheaper to buy new batts). If these are protected batteries then it could be the protection circuit has failed allowing the batteries to go that low or they are not protected.

It would help if you would have indicated the brand name and type of battery. vice my batteries :)
 

skullfreak

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A battery that has been discharged past its low voltage threshold of 2.5V = toast and dangerous to bring back to life without the proper equip (cheaper to buy new batts). If these are protected batteries then it could be the protection circuit has failed allowing the batteries to go that low or they are not protected.

It would help if you would have indicated the brand name and type of battery. vice my batteries :)

aw 18350 red
 

Nomoreash

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Aug 9, 2010
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A battery that has seen 1.5v has probably damaged the cell enough that it will never fully recover even if you can get it to work. They should never be discharged that low. Your charger probably has undervolt as well as overvolt protection which is why it's not charging the battery.

Sometimes if you just let them rest a few hours they will recover enough so they can be charged but that's usually only if they've been used slightly under specs, 1.5v is way below that so I'd personally just toss em. If you let them rest a while and the voltage hasn't moved up any they are definitely toast.
 
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