Every motorist at least once got into a situation when the alarm key fob hopelessly sat down the battery. In this situation, you have to use the key. However, few people know that in reality there is at least one alternative method using the same key fob. And no, you do not have to break or break anything in this method.
Why do batteries stop working? The general answer is no secret to anyone. However, what is the reason? The fact is that the electric charge in the battery appears due to a chemical reaction caused by the interaction of the anode (graphite rod), cathode (zinc cup) and the electrolyte between them. The negative ions formed at the cathode as a result of oxidation rush to the positive anode. Man gets his electricity! The problem is that in addition to the charge, during the chemical reaction between the electrolyte and the cathode an oxide film is formed, which further “kills” the battery even before all its resources are fully used up.
Due to the specifics of the device a salt battery can not be charged like a rechargeable battery. However, it is possible for a short time to destroy the very oxide film that prevents the chemical reaction. This can be done by heating the battery or by deformation without violating the integrity of the case. The easiest way is to heat the battery by dipping it into a warm (not boiled!) liquid and holding it in there for a while. However, since in the case of car alarm system warm water is unlikely to be at hand, you will have to resort to deformation.
Normal size AAA batteries are most often “brought back to life” with a gentle deformation with a pair of pliers. However, since they are likely to be in the trunk, you can resort to the help of the teeth. Carefully and confidently bite the battery so that its body is slightly bent, and with it the zinc cathode. This will allow destroying the oxide film formed inside and using such a battery a few more times (usually the trick with “recharging” is able to pull 2-3 more times).
The battery has to be exchanged very soon because the film on the cathode is formed only when the electrolyte is already breathing heavily. Abuse of “recharging” conventional batteries sooner or later leads to the destruction of the zinc cup and the shell, as well as leakage of poisonous electrolyte… well, or what will be left of it by that time.