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<blockquote data-quote="Nathan@XS Power" data-source="post: 6978250" data-attributes="member: 625646">Resting voltage for the D3100 is usually 13.2V. 12.9 would be fully charged. I would get a good AGM charger and charge it up fully and see what it goes too. Coming off of the charger it should read about 14.4V and then drop down to around 13.2V after 12 to 24 hours.Not trying to say anything is wrong with the battery, but if a battery is left for an extended period of time without recharging it can cause some damage to the battery. Any time a battery is stored and drops below 12.6V it can cause the plates in the battery to sulfate, which can decrease the life of the battery and the performance of the battery. You can sometimes bring the batteries back though.There may be nothing wrong with the battery at all. You will need to fully charge it first to determine the state of the battery. Feel free to give us a call if you have any questions.</blockquote>

[QUOTE="Nathan@XS Power, post: 6978250, member: 625646"] Resting voltage for the D3100 is usually 13.2V. 12.9 would be fully charged. I would get a good AGM charger and charge it up fully and see what it goes too. Coming off of the charger it should read about 14.4V and then drop down to around 13.2V after 12 to 24 hours. Not trying to say anything is wrong with the battery, but if a battery is left for an extended period of time without recharging it can cause some damage to the battery. Any time a battery is stored and drops below 12.6V it can cause the plates in the battery to sulfate, which can decrease the life of the battery and the performance of the battery. You can sometimes bring the batteries back though. There may be nothing wrong with the battery at all. You will need to fully charge it first to determine the state of the battery. Feel free to give us a call if you have any questions. [/QUOTE]

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