Actually, yes, but not without help. Reversing the polarity on a battery can happen only a couple of ways. If you have a wet cell battery are filling it for the first time, and are using an old style, non smart charger, and short the terminals while you are filling it, yes it is possible to hook up the charger backward and reverse charge it. You would not necessarily notice a spark because the battery gains voltage as the battery is being filled, and if it is being charged while you are filling it, the short would not be a strong enough discharge to create a spark. If that was to happen, and a charger was hooked on backwards, or if it was installed in a kick start vehicle and hooked up backwards, then you can end up with a battery that has been charged, but backwards.
What Happens If Jumper Cables Are Reversed on a Battery?
Jump Started or Installed Battery the Wrong Way
To save money and help extend the life of your battery, you can rely on a trusty battery charger. However, during the charge, you might jumble the cables and instead position the wrong cables on the inappropriate terminals. Polarity is the state of a system when it exhibits opposite physical properties at different points, for example electrical and magnetic properties. This term is usually used in magnetism, electricity and in electronic signaling. During the production of electric current between two poles or points, one of the poles has a greater number of electrons while the second pole has fewer. The first pole having more electrons will have a negative polarity, whereas the second pole with less number of electrons will have a positive polarity. The electrical current is produced when you connect both the poles with a conductor, such as a copper wire.
Battery Myth | Can a Battery ‘Reverse’ its Polarity?
Almost all drivers know that a car with a dead battery can be started by jumping it from a car with a charged battery. Automotive batteries are designed to produce the high electrical current required to start the engine. This routine procedure can become dangerous if the jumper cables are connected improperly -- if the positive terminal on each battery is mistakenly connected to the negative terminal on the other battery.
I accidentally connected a battery charger backwards, and now it won't start. What is the most likely thing which was damaged by my mistake? Before the mistake, when the key was on, you could hear the fuel pump getting power, but now you can't hear that.