Disassembling the battery, in the "Soviet" batteries it was possible to replace one or more cans that have failed, but modern batteries do not imply such interference. If you still hope to use the battery in the future, practice on a previously faulty battery, although after that its use is highly questionable.
Necessary
Rubber gloves, goggles, metal jigsaw, grinder, hammer, pliers, flat screwdriver, chisel, powerful soldering iron, gas torch, hair dryer, drill
Instructions
Step 1
Starter batteries are filled with electrolyte - this is acid diluted with distilled water to a certain proportion (density). The density of the electrolyte should be in the range from 1.25 to 1.29. The electrolyte is very aggressive and can cause skin burns, corrode textiles, paint on surfaces, and with prolonged exposure to metal. Therefore, if you are not sure that the electrolyte from the battery has been drained, take additional safety measures.
Step 2
It is better to drain the electrolyte from the battery through the drilled holes in the bottom of the battery case. Cover the ventilation opening of the battery cans so that electrolyte does not leak out when the battery is tilted. Lay the battery on its side and using a drill with a 3-3.5 mm drill, drill a hole in the upper part of the outermost battery can. Prepare a container for electrolyte in advance, preferably glass. Turn the battery over to the bottom, at the same time substituting the container under the drilled hole, unscrew the plug from the can (if there are no plugs, drill a hole on top of the can), so the electrolyte will flow out faster. Repeat the operation with the rest of the battery banks. If you intend to use the battery in the future, the holes made in the battery case must be sealed with acid-resistant plastic.
Step 3
The next thing to do is to rinse the insides of the cans with distilled water (just water, if the battery is under final analysis), electrolyte remains between the plates, which can later play a cruel joke. Further steps involve disassembling the battery without subsequent recovery. Using a grinder or a jigsaw for metal around the perimeter of the battery, we saw off the cover from the battery case. If you pull on the sawn-off cover, while holding the battery case, and together with the cover, the battery plates are removed or the cover comes off freely from the output terminals, then such a battery was not originally designed for long-term operation.
Step 4
But this only makes it easier for you, you do not have to knock the cover off the insides of the battery and break the crossbars between the battery banks. Otherwise, we take a chisel and a hammer and split the crossbars by inserting the chisel into the cut between the lid and the body. Then, with a hammer, alternate blows on the output terminals, holding the cover in weight, knock it down. If necessary, the terminals can be heated with a soldering iron or a gas torch, in extreme cases, we cut the cover with a grinder. Now all the contents of the battery are at your disposal.
