Do you know a technique to safely attach wires to NMH batteries
("C" cells) without soldering the wires to the battery which may harm the
batteries integrity?


** The industry standard method is a special form of spot welding using two,
close spaced electrodes.

You can get NiMH cells with welded, metal tags already attached - and solder
these.

Otherwise use ordinary soldering - like thousands do.

For battery packs subjected to high discharge rates, soldering produces
reliable, low resistance connections and spot welding does not.


..... Phil