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<blockquote data-quote="adulbrich" data-source="post: 8495093" data-attributes="member: 661255">Several ways:1. A direct short, taking the battery past full discharge.2. Parasitic drain. Small drain on the battery that lasts a long time, generally fully discharging the battery.3. Extreme heat4. Overcharging. Pump it with a high amperage at voltages above 15v. 200 amps @ 15.6v will cook it //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif5. Dropping it6. Sometimes, a cell dies. Usually, when that happens the battery will sit around 10v even after being charged. Several thing can cause a dead cell, but I can&#039;t remember all of the possibilities.AGM&#039;s are pretty hearty, especially if they&#039;re deep cycle. They can be fully discharged and recharged many times. The damage occurs when the battery voltage is taken below what is a safe &quot;fully discharged&quot; state. Also, if you &quot;gas it&quot; or it &quot;vents&quot;, permanent damage has occurred. You can&#039;t add any more water, because it&#039;s a sealed battery. When enough water escapes and the top of the lead plates is exposed to air inside the battery, that&#039;s bad //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif</blockquote>

[QUOTE="adulbrich, post: 8495093, member: 661255"] Several ways: 1. A direct short, taking the battery past full discharge. 2. Parasitic drain. Small drain on the battery that lasts a long time, generally fully discharging the battery. 3. Extreme heat 4. Overcharging. Pump it with a high amperage at voltages above 15v. 200 amps @ 15.6v will cook it [IMG]//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif[/IMG] 5. Dropping it 6. Sometimes, a cell dies. Usually, when that happens the battery will sit around 10v even after being charged. Several thing can cause a dead cell, but I can't remember all of the possibilities. AGM's are pretty hearty, especially if they're deep cycle. They can be fully discharged and recharged many times. The damage occurs when the battery voltage is taken below what is a safe "fully discharged" state. Also, if you "gas it" or it "vents", permanent damage has occurred. You can't add any more water, because it's a sealed battery. When enough water escapes and the top of the lead plates is exposed to air inside the battery, that's bad [IMG]//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif[/IMG] [/QUOTE]

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