Ups not working in battery mod because many problems
1)battery has dead or deep discharge and need to recharge the battery at least 8-10hours (read ups manual to find recharging time)
2)not affordable condition like extreme cold or heat not best condition
3)not used for 6months or above
Battery checking if you have a multimeter or voltmeter to read battery(remove ups cover saftely)voltage bellow 11.4v need to recharge or no volt battery dead a chance to recover by charge
If you have warranty do not open only charging and contact you dealer to replace them
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