second battery

[rsfm089]

A friend of mine asked me today if he could just take the battery out of his car and use it in the trunk for a second battery. Both are wet cell batteryies . I told him I wouldn't I would just get two new dry cell ones. My question is can u hook up to wet cell battery?

[MECHMAN]

The only draw back to wet cell batteries is they can produce explosive gases.. Excessive charging electrolyzes some of the water, emitting hydrogen and oxygen. This process is known as "gassing". Wet cells have open vents to release any gas produced, and VRLA batteries rely on valves fitted to each cell. Wet cells come with catalytic caps to recombine any emitted hydrogen. A VRLA cell normally recombines any hydrogen and oxygen produced inside the cell, but malfunction or overheating may cause gas to build up. If this happens (for example, on overcharging) the valve vents the gas and normalizes the pressure, producing a characteristic acid smell. Valves can sometimes fail however, if dirt and debris accumulate, allowing pressure to build up.