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the battery boiled out ?what to do!?


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If they boiled out, you almost certainly did damage; how serious depends on luck. Sometimes batteries can partially recover but you definitely reduced their capacity - how much can be best determined by load-testing. Alternatively, you can get an idea by checking sp gravity once recharged but that isn't as conclusive.

Absolutely check each cell with a hydrometer as one bad cell, which is almost inevitable in this scenario, will kill the entire bank.

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      link hidden, please login to view on the complex systems and parts under the hood of your vehicle. If you drive a car, truck or SUV with a traditional internal combustion engine, the battery in your ride is particularly vulnerable in lower temperatures.  Most vehicle batteries are 12-volts, and they consist of six cells. Each cell houses two plates—one made of lead, the other of lead dioxide. The plates are submerged in sulfuric acid, which acts as a catalyst, causing a chemical reaction between the plates producing about two volts of energy per cell. With six cells, you get twelve volts of power. 
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      link hidden, please login to view or disconnect and safely store your vehicle battery indoors. Car battery winter storage is also a great way to maintain the units of your favorite outdoor toys, such as boats, ATVs or link hidden, please login to view. Let the experts at the NAPA Network help you save money and get the most out of your vehicle battery by safely disconnecting and storing it this winter.  Disconnecting a Car Battery for Storage
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