New battery but REPLACE BATTERY light blinks

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BACK UPS 700 SL about 5-7 years old.

I just replaced the battery, but when I turn it on the REPLACE BATTERY red light starts blinking intermittently ( a few chirps every 5-10 seconds). How can I tell if the problem is a defective battery or a defective UPS? I have a VOM, but what parameters should I test for?

Thanks,

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New battery but REPLACE BATTERY light blinks

New battery but REPLACE BATTERY light blinks

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