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This UPS is not working even it is plug-in, as per my experience this happen when the UPS battery is drained, when this happen the battery needs to be replaced, the problem is the price of the battery is almost same when buying a new UPS so it is not worth to replace only the battery. But if we can revive the battery for a very minimal expense that is worth.
In this video I will try to revive the UPS battery see what happen...