The protections work all good. More you have to not really say.
There is no overload.
The concern expressed in other reviews regarding a criticism actually already broken battery, which is then further loaded wrong, I can not understand. This is no fault of the device but the user. If the user can not watch it or like it, then it must be protected battery cells buy. The then take over the task for him.
Also significantly more expensive devices can broken battery cells partially not properly recognize, as they show by their depths discharge just a different, unusual, characteristic. Only chargers that are less universal, ie only lithium ions can load cells have the ability to detect this deviation without a huge effort.
It can all cells are charged, from very small to very large. The downside of it is that may be loaded with a maximum of 500mA / h, the small cells and large are not also loaded with more. The charging time can therefore be very long.
I would buy the unit again and recommend it to anyone who is looking in this price range on!