Depends how old, how bad. 5 years is a good life for a battery with moderate work load. If the plates are just "Hardened" it can be recoverable if they are heavily sulphated, probably not. Like Walt says, charge for UP TO 24hrs at 5A or so with the tops LOOSE to let out the gas but not the splashes, check regularly, see if you can hear or see it "fizzing" enthusiastically, if so that"s it charged. See what happens then. See if it"s the same on all cells. DONT get your eyes in the way of splashes goes without saying. If it looks not too bad and you want to go for a bit of reconditioning, empty out, flush with water (Distilled/de-ionised NOT tap)get rid of any sludge ( that can be shorting the plates at the bottom of the cells). Refill with sulphuric acid at about 1250/1280 SG. Recharge till it fizzes. If you have/can get a hydrometer, a charged reading of 1250 or better is what you are looking for. Usual health & safety warnings. Hydrogen gas is what is fizzing, makes some good bangs !
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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