Today I accidentally placed a powerbank-pull battery the wrong way into my VP2 and within a couple seconds small amount of smoke and burnt smell came out from that bay. After that I decided to test the sanity of the VP2 by charging a 25R, first it seemed to be ok and showed 4.20v after completion, but after removing and placing it again it showed 4.21V. I always recheck the voltage like this and it has never happened before.
Has this happened to anyone else? The VP2 is supossed to have reverse battery protection, but from now on I should be extra careful when charging unmarked flat tops pulls in low light.