My nephew passed several hundred 18650 cells on to me stating they are Panasonic 3400mh and that's all the info I got. Most have no wrappings and the few that are wrapped are plain generic shrink sleeves. The only thing on them is some type of bar code (pictured). I did a quick test and indeed, I'm showing them at 3500mh+ on the several cells I tested. Any suggestions as to who/what/where? I'd like to be sure of the discharge rates before putting them into my toys (ebikes and etrikes).