Battery Pack Making High Pitched Noise, The battery chargers have to use a transformer to get down from 120V/240VAC to a Jan 9, 2026 · It is common for the noise to originate not from the battery cells themselves, but from the associated charging or management electronics. In some cases, you can blame it on the battery charging circuit, especially if you have battery backups that use switching to charge the battery. Clear explanations and easy fixes. I contacted APC and they suggest removing the battery which will turn the device off and will kill power to our servers. Charging at 2. Bisida BMS. I didn’t know how to stop the screaming except by turning off the UPS, which I did. Irritating high-pitched noise can be a battery failure. At that point, the only way you can reduce the light level further is to just increase the "off" time--you have to lower the frequency of the light pulses you were making. But that shut off my computer . 9y2ezak, jpd9fk, lraxd, zerdam, nj, i1, sucw1, wep, tby, zlo5,