You can still replace the batteries if they are swollen and cracked. Doesn't mean the units no good. That happens frequently to those small lead acid batteries. I used to work in the alarm business and have handled thousands of those.
I have wanted to get my hand on a UPS to play around with solar or wind energy. It can act as an inverter for converting the 12 VDC to 110 VAC. Haven't found one yet though.
Don't forget to recycle the old batteries
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