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Posted by The Raddish | Jul 02, 2008 @ 10:06 AM | 1,918 Views
Careful charging those LiPos, guys!

I'm in the middle of some pretty stringent LiPo qualification testing at work, and there are some things that we have discovered thus far. As a general rule, LiPos should rarely if ever be charged at a rate greater than 1C! Charging at higher rates will shorten the life span of your battery, regardless of claims by either the charger or battery manufacturers.'

For example:
A 2200mAh cell = 2.2Ah. 1C = 2.2A maximum charge rate, and should take about an hour to charge.

A 8000mAh cell = 8.0A. 1C = 8.0A maximum charge rate, and should take about an hour to charge.

A 350mAh cell = .35A. 1C = 0.35A maximum charge rate, and should take about an hour to charge.

Notice a trend?
Also, it is best to charge your LiPos to 95% capacity and not fully to 100% capacity. Again, consistent 100% charges will shorten the life span of your LiPos!

There is mostly good info above about discharging, but as a general rule you never want to take your battery below 3.2V/cell, and should aim for 3.4V/cell or more. This is the resting voltage (battery not plugged in to anything), not the loaded voltage (battery powering your electronics/turning your prop).

The useful range of a LiPo is from 3.0V - 4.2V, with the average being 3.7V. Anything above 4.2V can be dangerous and can set a LiPo off. If a LiPo's charge dips below 3.0V/cell, it is considered over-discharged and possibly may not be able to be recovered. 3.7V is smack dab in the...Continue Reading