Chosen Solution
Howdy, Been having a few issues with my Note 4, it constantly self-reboots, overheats when charging and quick decline in battery afterwards. Battery is not warped, but the plastic cover on top was cracked and loose (dropped one too many times, maybe??) Anyhow after charging overnight, it had a red lcd light on and after removing battery and putting back in (which usually works) it didn’t power on. I went and got a new battery. But when I started to charge it, there was no charging light, haptic feedback or even the battery level sign. I did a teardown on the phone and couldn’t find any damage throughout. I thought new batteries usually have some power. So did I get sold a dodgy battery or do I have another problem? Any suggestions appreciated. Cheers.
@theaznop a multimeter is not going to show you if the battery can actually hold a charge. I would start with a new battery just so that I have a known-good starting point. Then work my way from that. “overheats when charging " is not usually a sign of a bad charging port, but a sign of a bad battery, bad power management IC or short in the charging circuitry.
Sometimes new batteries are under the operating voltage meaning that it may not allow the phone to display a charging icon when you plug the phone in with the new battery to charge it. Once the battery voltage is high enough it will start to display a charging icon on the screen to indicate that the battery is charging. Depending on how flat it is it may either take a long time or if the battery is faulty the battery voltage will not go up. You can check the battery voltage by using a digital multimeter and using the probes on the battery terminals (on the battery).
