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how does a maintence free battery like Yuasa work?

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When the alternator overheats the battery you cant top off the distilled water? also at what temperature does the battery water freeze?

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If you use the proper acid for maintenance free batteries then it won't freeze period. Now if you are boiling over batteries on a regular basis then you should get your voltage regulator checked and/or replaced. Maintenance free batteries are just that maintenance free, so there should be no reason to have to top them off. They incorporate a labyrinth of venting on top of the battery to prevent spilling (and boil over to some extent). So follow the instructions when servicing a new maintenance free battery, keep your bikes charging system in proper working order, charge it often in the off season and it can last several years or more.

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Taken from the YUASA Technical Manual:

Here’s the real secret of a sealed VRLA battery: the negative

plate never becomes fully charged… so, no hydrogen

gas. The positive plate still makes oxygen, but instead of

being forced out the vent tube, it reacts with the charged

active material to become water again. That’s “gas

recombinant technology.” That’s the magic of YUASA’s

non-spillable, sealed VRLA battery.

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