My Makita drill is cordless and the battery will charge ok but runs low very fast. I was told there is fix for this. Some guys sell the info on ebay. Any help would be nice. I don't use the drill very often.
There are several steps you can take to insure that you get maximum performance from your cordless power tools batteries:
Breaking In New Batteries: new cordless drill batteries come in a discharged condition and must be fully charged before use. It is recommended that you fully charge and discharge your new battery two to four times to allow it to reach its maximum rated capacity.
Preventing the Memory Effect: Keep your power tools battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to the rule are Li-ion batteries which do not suffer from the memory effect.
it is quiet easy to do but there's a whole book load of theory behind it, however regardless of that here it goes obviously you will need open out the battery. before opening, do top up your batteries for 5 mins from total exhaustion (fully dead/drained battery - charge or 5 mins). once open from its casing, make sure to keep them isolated from each other avoiding a short. measure the voltage across each cell. provide a exhausting load and the measure the voltage across each battery. let the battery drain with the load and quickly measure the voltage drop across each. at this point in time you should get at least one battery reading full voltage on its terminals whereas majority would be totally dead or slowly gaining pd again. the cell/s which regain voltage instantly after exhaustion are known to have a huge increase in their internal resistance and thus ....blah blah blah happens causing the other cells to discharge to this battery during a closed circuit/ current flow.
how to fix it.....pull out the bugger/s and replace. normally one cell is 1.2 volts. normally only one cell will be causing the problem however i have had one case where i had three cells bad. should you be unsuccessful in one attempt.....do not worry.....more buggers are probably hiding in the pack. they show up from the worst to the least bad ones. repeat the procedure several times to get things right.
Word of warning:
do not mix different batteries together...if you have NiMH battery pack, use NiMH cell. do not mix NiCAD and NiMH and so on. annother theory lays supporting this statement. in simple they have different charging/ discharging rate. C10 to C50 range, different operating temperature and thus performance of one cell would differ from the rest if mixed cells are being used.
i do not wish to disrespect anyone's practical experiments or experiences but to my knowledge a welder normally works at low voltage high current which will merely destroy the battery pack if not cautious about this. the act does work but the effect doesn't last as much.
batteries don't have memory...they work on chemical reactions. improper cycle of the chemical reactions will lead to breakdown in chemical compounds in within the battery thus .....higher internal resistance...blah blah blah blah....better way to say then the memory line in the last post. sorry no offense to those who have posted here.