I have an UPS rated around 425VA. It uses a 7Ah battery. I've heard that the backup time can be increased by adding one (ore more) batteries. The make/model of my UPS does not have a connector/cable intended for adding another battery. Should the batteries be connected in series or in parallel (using some separation diodes)? The current drawn from batteries and the voltage drop across the separation diodes might pose some problems. Connecting the batteries in series might confuse the electronics that the batteries is charged. I know that this might be a simplistic approach but did someone tried this? (Any explanation, details, links or schematics wolud be appreciated).
Definitely, you would add the second battery in parallel, and yes, it would probably work fine provided the battery you chose was very similiar (same type, rating, and chemistry, preferably get the same model as the UPS manufacturer did). There would be a practical limit as to how many batteries you could add - the UPS provides a trickle charge to the battery probably 24/7, and if the sum of the self-discharge rates of the batteries exceeds the trickle charge current, the batteries will eventually become discharged. But I would guess at least 2 batteries of the same type will work just fine, perhaps also maybe half a dozen.
Sure, add another battery in parallel.
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