Love my TA21..

Uses the 18650's so I own two of those.. keep one on the charger one in the light .. and a spare set of cr123's just incase I somehow don't charge both bat's..

the 18650's last mad longer then cr123's ( well with the 3000mah one's I have)

I'd buy another fenix if I ever mange to break this one.. I dropped it.. thrown it .. used while making an unruly bar patron find his way out the door ( those "tactical" serrations really do work ... ) ... camping .. toured the country with it 3 times on rock tours dropped it once from about 20 feet to wood flooring other then dings and scrapes works just fine.