Need some help Charging lipos - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-03-2012, 06:01 PM   #21
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I am: Max Xu
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Re: Need some help Charging lipos

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Originally Posted by Arceenut View Post
New to LiPos. Please explain to me what the detriments are in storing batteries fully charged? One of the advantages (as told to me) is that LiPos do not self discharge and will hold their charge over long periods. This storing at half/third charge defeats the "instantly available" feature that seems to be one of the advantages of this type of battery.
According Mr. Lucien Miller, the electric engineering guru in the RC world, the chemical substance is in a high energy and unstable state when a lipo pack is fully charged. The electrons have a strong tendency to flow but are being held back until a loop is formed.

I imagine this will cause some fatigue and thus have a greater potential to damage the battery?

Anyway, my experience seems to suggest fully-charged state is not that detrimental to lipo batteries, while overcharge and over-discharge are. Overcharging is dangerous and can cause explosion/fire. That's why using an accurate charger is very important. When you buy chargers, you can give up bells and whistles but not the cut-off voltage accuracy. High-end chargers allow you to set your own cut-off voltage. It may be a good idea to set your cut-off voltage to a little lower than 4.20v, to give some room for errors caused by inaccuracy of the charger. To fly 15 seconds less each flight is not such a big price to pay for longer battery life and better safety. Over-discharging is also a big no-no. It can easily kill your battery and make it totally unusable.

With a little care, I think even a cheap battery can power hundrends of flights.
Max Xu
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