It won`t charge but It can only use Battery power.
I need help with my UPS. It won`t charge the battery that I replaced but It can use battery power. I replaced the battery that came with the ups (because its defective) and the replacement battery is charged. I replaced the battery with the same specifications (same amps and volts. no slight difference. EXACT). I used the replacement battery and it works fine. After Im done using it. I tried to charge it for 8 hours. Then I use it again. It won`t start and gives slightly-long beeps which means its low. Connectors are brand new and tested with other appliances. Fuses are tested with multimeter (Board fuse 2x 30 amps and fuses at the AC input female). I checked continuity of the wires and all of them are in good shape. Can anyone help me? You can tell me what to do with the board (I have knowledge about electrical and experience in soldering, etc). Do I need to change something like a capacitor or a mosfet in the board? I can send a picture of the board itself ASAP right when you asked for it.
Brand: Powercom Black Knight Pro
Model: BNT-650A / 650A
Board Model: BNT V3.0
Battery: CS3 GP 1272 F2 [12 volts 7.2Ah]
Battery is in good condition. Tested with another UPS.
Thanks in advance :)
Diagram (Source: ElektroTanya):
Images (Source: Mine):
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