Very Good
genuine vapcell s4+ charger, good quality, nice features, especially cap test, very useful in differentiating between good and bad batteries. bad batteries will have issues completing the cap test, making it glitch out, like showing random resistance number (range from literally 1, to 260) for the same cell in the same slot, unable to discharge once charged full, or sometimes stuck at 0%, etc. just a bunch of weird behaviors. not the best way to differentiate between good and bad batteries, but it gets the job done. the cap test is not accurate on the bad/fake batteries, dont believe the numbers when it says like 38mah, they should have more than that, usually they can still be used, but just definitely not the rated capacity, and they are bad at holding charge.