el_walto wrote:Well that sucks. It really is looking like no one should ever build a hobbyking battery without cell level monitoring.
I think most agree that a cell LVC and HVC would likely have stopped this from happening.
I don't ever monitor my cells.. i haven't in years actually, after doing it for one year.
Why can i get away with this? i discharge graphed all my packs and paralleled everything at the balance taps.
I found 3 packs out of 28 which had anomalous cells ( different IR, low capacity, etc. ) and set them aside.
I balanced all my packs within 5mV with an expensive charger ( iCharger 1010b+ ).
Then after that, i only charge up to 4.17v nominal, and only discharge to 3.5v nominal.
100's of cycles and no problems.
But this can only be done with proper equipment, which nobody wants to invest in. That crappy $30 hobbyking charger is just too appealing. It can only be done if you are willing to take time to sort out the packs that hobbyking sells you, as they *will* ship 1-2 packs with a faulty/mismatched cell for every 10 they ship.
If you cannot handle this, get a BMS or forget owning the most dangerous chemistry you can possibly buy otherwise you're risking your life, other people's life, your property, and other people's property. No kidding.