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Old 12-24-2017, 06:29 PM   #1
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I have the Basement watchdog backup sump pump. I had the unit and battery unplugged for a month and I hooked it back up and says battery is 25% but it's not charging. I tested the fuses and have continuity. I then unplugged everything, checked the battery and it is 12.45 volts. Plugged everything back in and the unit now says it's 100% fully charged. Any ideas what gives? Obviously it's not charged at 12.45 volts and it doesn't say it's charging. Any ideas?

Last edited by Shelby2098; 12-24-2017 at 06:56 PM.
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Old 12-24-2017, 06:59 PM   #2
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Re: Basement watchdog


See below.
Read frequently ask questions. Pay particular attention to:
How long does it take to fully charge a battery after it has been used extensively?


A 12V battery will show 12V approximately unless it is totally discharged. Voltage does not indicate the status of charge or discharge.
Easiest way to measure the state charge is with a hydrometer.

Also check water level of each cell.
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Old 12-24-2017, 07:06 PM   #3
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Thanks for the link. I'm more concerned of the inconsistency of the unit telling me that the battery is 25% and not charging and then 100% and fully charged.
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Old 12-24-2017, 07:51 PM   #4
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Re: Basement watchdog


Make sure that post on the battery are clean and cables are secure. The charger is probably using the resistance it meets to determine the state of charge.

A hydrometer doesn't cost much (automotive store).
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Old 12-24-2017, 09:19 PM   #5
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If I have one of the maintainance free marine batteries, can I still get to the acid?
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