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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 12-09-2017, 04:30 PM   #1
Fishbonez
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Default Not what could but what will...

Just curious,
suppose you have a 1 cell battery that normally charges to 4.2 volts. You for some reason, that doesn't come to mind, lack a little common sense and you attempt to charge it to 4.3 volts. What would happen to the battery? We are talking about 1/10 of a volt, would it make a difference or make a disaster? Just something I was thinking about is all.

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Old 12-09-2017, 11:06 PM   #2
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To charge to 4.2 volts they are probably injected with a higher charge of 4.5 volts anyway.
I doubt anything will happen.
Same as 11.1 volt batteries charge up to 12.6 volts and use a higher charge to get to that.

A car battery is 12 - 12.5 volts but generally have a regulator charge feed of 14.8 volts and a Taxi regulator is usually
about 15.2 volts
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Old 12-10-2017, 02:02 AM   #3
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Nothing should happen as RC LiPo manufactures cover their buts and most can be charged to 4.3 vpc although do not make it a habit as you will significantly shorten the battery life. RC LiPos we use are hybrid LiCo on steroids using a Gel Electrolyte which gives them a slightly higher voltage profile. For max battery life, double that of 4.2 volts, lower voltage to 4.15 volts. You only give up 5% capacity but gain a lot of cycle life. Charge no faster than 1C.

I am just going to assume you did it since you asked. If the battery did not heat up or spew flames, you got away with it.

FWIW you can tel the specific energy density by the Lithium cell voltage. Example a 2000 MAH LTO lithium (Titinate) is the same size and weight as a LiCo (Cobalt). The LTO is 2.6 volts and LCO is 3.6 volts nominal. However they are not equal even though they both have the exact same amp hour capacity of 2000 mah. The LTO battery has 2.6 volts x 2 AH = 5.2 watt hours of energy, while the LiCo has 3.6 volts x 2 AH = 7.2 Watt hours or 28% more energy. A RC Lipo is 3.7 volts or slightly more energy of 3.7 x 2 AH = 7.4 watt hours. The issue with higher energy density is stability, and RC liPos are not stable and thus why caution must be used when charging and storing.
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Old 12-10-2017, 09:40 AM   #4
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Interesting,
No I have not tried it because my imagination gets the best of me Feared could be a disastrous experiment

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