Battery charger AAA and AA NiMh with different capacities

[infoclogged]

The battery charger I have is microcontroller controlled and has 4 slots, but its written in the user guide, that only batteries with same capacities should be charged at the same time and that too pair wise ( ch1 + ch2, ch3 + ch4 ). Moreover, AAA cannot be mixed with AA.

So, what are the reasons for such constraints ( pair wise battery charging and also same capacity battery charging and non mixing of battery type ) ?

I would like to know, if there is any possible battery charger available in the market, possibly with an information display, that can charge batteries of different capacities such as ( 2100 mAh and 1750 mAh ) without any negative consequence on the batteries?

 

[kanewolf]

What about something like this -- https://www.flowtoys.com/12-bay-nimh-charger/ It says it has 12 independent charging channels.

 

[infoclogged]

What about something like this -- https://www.flowtoys.com/12-bay-nimh-charger/ It says it has 12 independent charging channels.

Thank you for the keyword "indpendent charging unit". Thats what I was looking for.