Nick Farrow Posted September 18, 2019 Share Posted September 18, 2019 Hi, I have a number of lipos that are showing something like 60-70% of their capacity. They 'sag' quickly when used and when put on a discharge/charge cycle confirm that the capacity is reduced. I was wondering what to do with them, they can be used for flying but with such a restricted and diminishing flight time they a a bit of a liability. On the other hand they still have some useful capacity, but I have yet to find a use for them! Time for the bin, or do you have any ideas! ?? Thanks nick Quote Link to comment Share on other sites More sharing options...
Geoff S Posted September 18, 2019 Share Posted September 18, 2019 If you still have some ic engines then they may work OK on an electric starter - saves lugging a heavy lead acid battery around. Or use in something less critical like a small rc car, perhaps? Our bathroom radio is mains/battery but we use it with batteries. It's an ageing Roberts which should take 6 'D' cells, which would be costly, but I've modified it to take a 7 cell NiMH 3000 mAH pack. That pack has been in use for over 5 years but perhaps your old LiPos might be used in something like that. Geoff Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 18, 2019 Share Posted September 18, 2019 While old NiMH cells are fine, I would be wary of using old LiPos around the home due to the fire risk. Quote Link to comment Share on other sites More sharing options...
Brian Hammond Posted September 18, 2019 Share Posted September 18, 2019 Replaced the battery in my Lidl drill with an old Lipo and it is better than new and lasts longer! Quote Link to comment Share on other sites More sharing options...
Old Geezer Posted September 18, 2019 Share Posted September 18, 2019 Like Geoff - I use a pensioned off rechargeable - in my case a 4S 2300 LiFe flight pack - so much lighter than the alternatives and never seems to need topping up ( but I do anyway, when I think about it ). I would never use the LiFe in another airframe - this one cost me a much flown ( & much loved ) hack when it browned out a Spekkie Rx when I tried go round again when I overshot a landing. I know - that's why we have timers. Carelessness costs airframes! Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 18, 2019 Share Posted September 18, 2019 I've got a HobbyKing USB CHARGER. CHEAP. Plug any 2-6s lipo, or any other li chemistry battery. It tells you the individual cell voltage. And it has a USB socket in the ther end. Currently running this I Pad. has auto shut off, will not over discharge the lipo. I would also second the use of old lipos for engine starters. I favour 4 s for 12 volt starters. I find it minimises switch welding. Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted September 18, 2019 Share Posted September 18, 2019 I pensioned off an old and slightly puffy lipo for starter duty, only problem was when I came to recharge it (not balance, but C1) the lipo puffed up and then vented! I would be inclined to dispose of them at end of life and be very careful of using and especially recharging lipos that no longer perform well. Quote Link to comment Share on other sites More sharing options...
BikerDon Posted September 18, 2019 Share Posted September 18, 2019 When they start to deteriorate,I use my old 3S/4S LiPos for things that used to be driven by 12V lead acid batteries. Such as the compressor for my air retracts, electric starter, i/c control panel, field charger etc Edited By BikerDon on 18/09/2019 16:36:17 Quote Link to comment Share on other sites More sharing options...
Nick Farrow Posted September 19, 2019 Author Share Posted September 19, 2019 Thanks all, I just wanted to make sure I was not missing a trick I am nevos of using them for household devices, like you. However I do strip them down and pick the 2 best cells and use them for a tx power source (with a voltage regulator) that seems to work for me. Just as an aside, would you expect new packs to balance? I have had some 1800mah (nanotech) from hobbyking that wont balance, Do they accept them as returns in this case? Regards nick Quote Link to comment Share on other sites More sharing options...
BikerDon Posted September 19, 2019 Share Posted September 19, 2019 Posted by Nick Farrow on 19/09/2019 16:54:53: [Snip] Just as an aside, would you expect new packs to balance? I have had some 1800mah (nanotech) from hobbyking that wont balance, Do they accept them as returns in this case? A lot of my LiPos don't balance, they just sit there balancing on my budget charger until it times out at 120 mins. I would be more likely to blame your charger if its not a decent (£££ ) one. The way the budget ones balance is really naff - they just bung a resistor across the cells with high voltage while charging, this really isn't ideal. Trust me I was an electronics engineer for many years... Edited By BikerDon on 19/09/2019 20:09:33 Edited By BikerDon on 19/09/2019 20:10:01 Quote Link to comment Share on other sites More sharing options...
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