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The batteries inside an ECotech Backup Battery are deep cycle sealed lead acid batteries, with a voltage of 12 amps and either 17-18 amp hours of a rating.
You can buy a direct replacement and do the job yourself at home, easily. There are forums on 'replacing ecotech battery backup' if you look it up, you can find a guide.
The replacement battery as uwish said is only around 50$ to get.
Also, a 'perfect' condition SLA battery should have a full charge voltage of like, 13-14 volts or so, IIRC.
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