Lipos

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I have two 4s Lipo batteries one is 8000mah the other is 10000mah I got them for free from a guy he had them sitting awhile and I'm discharging them to 12.8volts so that's 3.2volts per cell and I'm doing it at 1.0A slow but steady after that I believe I will balance charge them at 1.5A or 2.0A and get the battery to 16V total so that's 4.0V per cell and test how long it flys ect I realize there is electrolyte decomposition with lipos and especially if they sat for 1-2 years with full charge. Now both the batteries are slightly puffy I watch them closely and I charge them in my barbeque outside lol trust me SMART. So I just want to make this post incase other have dead lipos or old lipos.
 
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I know it's bad and risky but 8000mah and 10000mah batteries cost so much I believe cheapest 8kmah is like 120$ and a 10kmah battery is like 200$ they are definitely weak batteries but because they Sat for so long it's not like they were overcharged or dead they are just weak they dont hold much of a charge I can get like 10 to 12 mins of hover flight and darting around. I will keep a very close eye on them. When I can I will replace them Capt KO for sure.
Slightly puffy? Would not suggest using them in the air.
 
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I know it's bad and risky but 8000mah and 10000mah batteries cost so much I believe cheapest 8kmah is like 120$ and a 10kmah battery is like 200$ they are definitely weak batteries but because they Sat for so long it's not like they were overcharged or dead they are just weak they dont hold much of a charge I can get like 10 to 12 mins of hover flight and darting around. I will keep a very close eye on them. When I can I will replace them Capt KO for sure.
Understand. My Gannet drone batteries are 4S 5200 mAh $120.. Haven’t gotten one yet to try to find an aftermarket. Has more pins than normal 4S. Good luck.
 
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Yeah the drone specific batteries is where they really hook us. My phantom 3 is battery specific. My older Dji F550 from 2012 it can use pretty much any 3s lipo or 4s lipo you know so u can use them on RC cars ect..
 
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The waterproof Gannet Pro drone (not shipped yet due to the virus) Purposely uses batteries that can be purchased from third party suppliers. Just have to find them once I see it. No way DJI would do that.
 
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just dont, used 2 puffy batteries, just had problems, from unexpected (unexpected because p2 was high in the air - thus conclusion that battery is fine) crashing in midflight to weird turns and crashings, changed motors, spend hours in looking for a reason then just bought 3rd party battery and every problems disappeared ... dont use puffy batteries
 
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Hmm interesting ima still use mine unless someone gives me 300$ to replace my two puffy batteries I love flying too much to not fly. Plus I'm out on the desert if i crash it's literally dirt and trees no one for hundreds of miles in my area.
 
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Metal ammo box for lipo storage safety first :)
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I have all my fixed wing lipo batteries in a 50 Cal AMMO can. I use to do RC submarines and had the Sub Driver tube leaked water into the battery compartment. That caused 1800 mah lipo's to swell up. I was told that you should soak the batteries in salt water for two weeks then discard them. Swollen lipo's are very dangerous due to fire? That's just what I was told.
 

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