What causes car battery failure?
There are several external factors that contribute to battery failure. Excessive heat causes the positive plate to quickly corrode and this dries out the battery cells. This is probably the number 1 reason for failure. Extreme Cold weather makes your engine harder to crank because the oil thickens in your car and this puts a heavier drain the battery. This also is a contributor to failure. If your battery isn?t securely held down, vibration will shed the active material from the batteries plate grids. This will cause failure. Overcharging causes a battery to over heat and cause gassing. This is where the electrolyte turns from a liquid to a gas and is expelled out of the vent holes, leaving the plates exposed. Soon the plates will short and the battery will fail. Other factors that can cause battery failure include corroded cables and/or terminals, sulfation due to inactivity, alternator and/or regulator malfunction or electrical shorts in the battery itself.