Dear WP users, i recently managed to install a 12v ah battery on my Ptcl dsl modem (12v1amp) and Tplink router (12v1.5amp) as it was mentioned in prevous threads and aijaz bhai recommended. I am using adapters of both devices in parallel, and connecting those wires to battery and then to the devices. It was going fine for few weeks, but now I have seen low battery backup, only half an hour, (i know the adapters of both devices are 12v and they will not charge battery full) it used to give 2-3hour backup.
Now when battery goes low, the volt of battery gets lower upto 5-6v only, which i think bad for both devices, the modem dont work at this volt but routr does.
I need any kind of circuit to power off both devices when volt goes down upto a limit i.e 9-10v. Is it possible? Can anyone help me?