Recommended:
https://www.distrelec.ch/Web/Downloads/_t/ds/Panasonic-ENELOOP P 4XAAA_eng_tds.pdf end of life
Used in the lab: BK-4HCDE/4BE - Rechargeable Battery Pack, Ni-MH, 1.2V, 930mAh, Pack of 4 pieces, Panasonic Industry Europe
