I'm worried if someone charges my single-cell lipo with an Apple USB power supply that it'll get damaged.

***Is there documentation on Apple's USB chargers?***

I'm imagining I want to be able to support old apple chargers as well, so well-managed documentation on all the different ones out there and their versions would be nice (e.g. iPhone, iPad, other ones...). Haven't found anything yet. Is this just something people hack to find out and Apple never officially tells anyone what they do?