|reply to surendra |
Re: it is safe for ups inner circuit
The charge time for a large external battery with that UPS will be downright ridiculous!
Manufacturer spec is 6 to 7 hour recharge time, and that's with the tiny internal 12V 7Ah battery.
You're better off obtaining a UPS that is already designed to accept external batteries, as they usually have chargers that are capable of a much higher output so that the batteries can be recharged in a reasonable amount of time.