Thread: New Product AXN Floater-Jet (aka Cloud Fly)
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Old Jan 02, 2013, 07:42 AM
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My understanding is that the lifespan of LiPos is shortened by:
- usage (they all have a limited number of cycles in them)
- age (their capacity slowly decreases over time)
- charging above 4.2V/cell (this is unusual, as all LiPo chargers stop at that voltage)
- charging at high C ratings (especially if you go above and beyond their advertised rating)
- let their voltage drop too low (you will hear all sort of theories here, with numbers ranging from 2.9 to 3.3V/cell)
- store them fully charged (best would be to store them at about 3.8V/cell, most chargers have this ability)
- store them in warm places (apparently if you store them near freezing temperatures they lose a minimal fraction of their capacity)

Now, which ones of these factors has the biggest impact I do not know, but back then I contacted Outrage (NRG LiPo batteries) and they told me that leaving them fully charged for long periods of time is probably the worst thing you can do.
As a confirmation that this is at least something to avoid, Apple tells you that if you store your iSomething for long periods, it's better to do it with the battery charged between 50 and 75%, not 100%.

Based on the above, my personal recipe for long battery life is as follows:
- unless I'm in a hurry, charge them at 1 or 2C
- time my flights so that the resting voltage is around 3.7V/cell (I find this a better method, than the famous 80% capacity rule)
- store them partially discharged (as said, 3.7V/cell) and charge them only before using them
- store them in a cool place

Just to be clear, I do not have any hard evidence that this method is better than others, it's just my semi-educated guess.
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Last edited by 120ccpm; Jan 02, 2013 at 07:53 AM.
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