Learn something every day. Mark Jones Oldsmar, Fl
N771MJ “WunderBird” www.flykr2s.com flyk...@gmail.com > On May 15, 2024, at 5:05 PM, Larry Flesner via KRnet <krnet@list.krnet.org> > wrote: > > > > > On 5/15/2024 3:26 PM, Mark Jones via KRnet wrote: >> Some batteries are now coming with a built in BMS. Battery maintenance >> system. Mine has one and I have already seen it work. It will not allow the >> battery to discharge past a certain point. There is an internal cut off >> switch. I was draining my battery by cranking the engine with fuel valve >> off ( by mistake) and all of a sudden I had no battery power. Ten seconds >> later it came back up but needed charging. Slapped a lipo smart charger on >> there and it’s good as new. >> >> Mark Jones >> Oldsmar, Fl > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > All "rechargeable" lithium batteries have a circuit board that monitors > charging, discharging,and temperature too hot /cold. Even the small > rechargeable cells similar to an "A" size battery will have a mini ckt brd > the size of your pinky fingernail, usually concealed under wrap on the + > end. Your lithium powered drill can drive a 3" screw in to solid oak and the > next time you pull the trigger it's dead. The CKT BRD will not allow it to > discharge below a specific voltage level (30% ?) or the charger will not turn > on to recharge the pack. Any multi-cell pack will be monitored for balanced > cell charging. Pack too hot or too cold and you get a "bad pack" flashing > light. The technology of these battery packs, yes your 12 volt battery is > still a pack, multi-cells, that is in no way similar to the black plastic > containers with lead plates and acid and you must insure they are compatible > with the system in which they are installed. Each type of battery has it's > own unique characteristics / requirements / failure modes. Know what they > are and proceed accordingly. > > Here is a photo of a simple little 3 -18650 cell pack and the ckt board (BMS) > . Your 18 volt drill pack will have 6 of these cells. > > Larry Flesner > > > > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet
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