![]() I use the nicad only as potential backup batteries when I do things like go to the junkyard and cut a bunch of body parts off of a donor car type of thing and don't want to run out of juice while I'm out there, which is maybe twice a year. Only reason I even own the nicad is because they came with the drill I bought two years ago. I have a pair of two year old 18V nicad DeWalt batteries that I basically never use because I use the lithiums instead (which yes, do blow away the nicad in my opinion). For planes you might not want to cut motor power while in flight. And our electronic speed controllers have minimum voltages where they will cut power to the motor before damaging the pack. ![]() Continuing to use the battery with a cell at zero volts basically reverses the polarity of that cell and will quickly damage it.īack when NiCad batteries were the only thing we had for electric RC cars and airplanes, we paid big bucks for batteries made from cells that were closely matched by their discharge curves and we used balancing boards to bring all cells to the same voltage before charging the pack.Įven with the LiPo batteries we use today, good chargers monitor the individual voltage of each cell and will charge each one individually to balance the overall pack. So one cell may hit zero volts while the other cells still show a little voltage. Unless cells are tested and closely matched before assembly into a battery, they are each going to discharge at slightly different rates. Have you ever drained the battery packs down to the point where the drill wouldn't even move, or close to that? If so, you may have killed or damaged a cell by reversing it.
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