The best ones are APC,currenltly 650VA goes for around 6-7k but the batteries i realised are normally not the APC ones(am not sure if they change them for low quality ones).But a frnd of mine is using a car battery.He connects the terminals to the UPS battery n that way bothh batteries are cahrged.
Did you say 650 KVA? That must be a one beast of a UPS.
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