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While I'm pretty sure what you suggest is possible, having a Automotive battery in your house and next to your computer does not sound very safe. Automotive batteries out-gas acidic fumes when discharging or being charged, not to mention the heat that can be involved during either cycle as well. Most UPS mfg's sell additional battery kits for extended hold-up time, some are external (but usually a sealed battery type) I would suggest you look into that or consider upgrading to a 900VA or better UPS model for additional hold-up time
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