I have a few Makita 18V LXT Li-Ion cordless power tools. Recently, one of my battery packs wouldn't take a charge using the default charger. Since the battery is out of warranty anyway, I plan to take the battery apart to have a look when I get the time. Does anyone here know what type of cells Makita uses to build these packs? I saw a video on YouTube of someone taking one apart and know that there are 10 cylindrical cells in a 5S, 2P configuration. If the fault is the result of one or two dead cells, would it be as simple as replacing those cells? The thing I'm most unsure about is whether or not the charger will reject the new cell(s) inside the pack since Makita claims that the charger communicates with the pack when charging.
On a different note, my cheapo no-brand multimeter just died on me and I'm looking for a replacement for it. I want to step up to a Fluke but find myself inundated with different model choices. I don't mind spending more for extra features so as to be sure I won't need upgrade if/when I decide to get more involved in electronics. I would appreciate any recommendations.