The Fenix is about 10% thicker and longer (164mm x 25.4mm) than the Mini Maglite. Both fit into the bike mount AF02 of Fenix. The light intensity are extremely different. The Mini Maglite is approx 5-10Lumen compared to the settings of other Fenix LED lamps. The Fenix E21 has offers in the bright Settin 170 lumens (2h15min with Ni-MH and 1h with alkaline batteries) and in the low setting 54 lumens (11h with Ni-MH and 8h with alkaline batteries). These are information from the manual, which is also in German. It can be used Batteien normal. The light is bright white. The lamp body is fairly robust and can be on and to screw easily. I personally would prefer the switch front side than at the end.