I realised right now that our commercial battery lacks of the protection circuitry preventing the cell to discharge below the safety voltage (3.0v). As far as I know, this could be very very dangerous.
Well it won't do the battery much good, but apart from that no great problemregardsAllan
The battery won't explode or catch fire if it is discharged below about 2.8 V/cell, but it can be damaged to the extent that it won't take a charge (and attempting to charge such a battery could be dangerous).
It is a good idea, and relatively simple to add the protection circuit. If you are not comfortable with soldering, find someone who is, to help.
To get a more predictable lifetime, will it work with a six cell "12V" Pb H2SO4 motorcycle battery or smaller ?Expected maintenance cycle is for complete replacement in 1000 cycles or 3 years whichever is soonest.Lead batteries might seem to need less cell to cell balancing than Lithiums, at the expense of being heavy .
Don't do that !Taking apart a three cell Lithium battery is unlikely to improve its reliability
In ten years of RC aircraft flying , most of the Lipos that"puffed up" , did so after discharging them to less than 3.2 V/per cell, not 2.8 V/per cell.
Ok, so the safe threshold is 3.2v. Anyway, how can you know that your battery is approaching this threshold? Does your drone warn you in some way (with light or sound)? Another question: do you agree with the other user Allanhurts (see previous replies) that a "puffed" battery is not dangerous by itself, but only if I try to charge it again? Thanks for your opinion
all-battery.com sells round cells with built-in protection and you can get them with or without the wires. Very simple to work with. Just connect three in series and you're good to go.
If you already have a battery pack you could use a BPC that doesn't have connections to the individual cells in the pack and eliminate the need to disassemble your pack.
In ten years of RC aircraft flying , most of the Lipos that"puffed up" , did so after discharging them to less than 3.2 V/per cell, not 2.8 V/per cell.Ok, so the safe threshold is 3.2v. Anyway, how can you know that your battery is approaching this threshold?
Over discharge protection Over discharge detection voltage (Cell) 2.5±0.080V
mmm.. interesting but I still miss how to connect this circuit to the battery pack. Just to know, the battery I'm using now is a turnigy 11.1v 500mAh