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Or did you miss a 'smilies' off, ?, ?, ?, .... . |
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Even charging the battery once is just asking for disaster, if it arrives at 3.8v/cell storage charge that ought to be enough for anyone. |
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A common misconception that leads to unnecessary waste. The more you use the battery without it failing, the better your reliability statistics become. So you want to do exactly the opposite of what you're doing. Buy only one battery and use it for everything, recharging it as often as possible. The more you do it, the more reliable the battery becomes, right up until the point it fails.
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Floey, it is the only safe way to fly.
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By the time he noticed, it was so far over his head, all he could make out was a tiny speck in the sky. Too small by then to see it was all a joke...
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Yes with LFP if not showing any obvious signs of danger, I would use them maybe to 65% SoH.
From what I've seen properly cared for and in a non-propulsion low C-rate use case maybe 75% avg DoD, that may be well past two decades of daily use, maybe even three. But I would definitely not advise just keep using them until gross failure. But LFP is well OT here, since the OP is about LiPo specifically, propulsion use cases at high C-rates and deeper avg DoD. |
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I did an job interview a few years back at Boston Power. Of course, I mentioned I was an avid RC electric flier and used LiPos for everything. When I said my belief was that LiFe batteries were much safer than LiPo they all just laughed. They said they're more rugged and they dissipate heat better because of the cell construction, but the principal difference when it came to safety was more about the usage profile, how fast they're charged, how fast they're discharged, how high they're charged to and how deeply they're discharged. I did ask for a few clarifications but it didn't change their bottom line message. And not having an advanced degree in chemistry, and of course wanting to still be considered for the job, I didn't tell them I thought they were wrong.
What they said was, what makes the large LiFe battery packs in an electric car or Tesla Powerwall safer has less to do with the battery chemistry and was more to do with the battery construction and BMS (which isn't just charge/discharge. It's also heating/cooling and the ability to electrically isolate cells if the BMS sees them misbehaving). One major contributor to LiPo failure is the breakup of electrode material caused by the physical stresses that occur during charge and discharge cycles. Cylindrical cells resist this damage better than prismatic. So a cylindrical LiPo might not be much different from a cylindrical LiFe cell when it comes to the probability of failure. Except cylindrical LiPos are hard to come by. But comparing cylindrical to prismatic isn't necessarily apples to apples, apparently. |
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