... Except mobile phone batteries (and lead) can really load this equipment everything, and that as far as I can judge so far gentler on the battery. The few batteries that are acknowledged by joyful triple blinking, coming into retirement. Small drawback: the contacts do not fit perfectly to some of my AAA, but with a small flat power magnets can also be the remedy.
Addendum: Mobile Phone Batteries can load also - if one solves the problem of making contact. For me with a Far East loader whose electronics had gone away ...