Fenix ARB-L18-1100P

The 1100mAh capacity is spot on for getting through a full evening of use without swapping cells. The protection circuit gives me peace of mind when I toss it in my pocket with keys, and it charged up nicely in my usual charger. Solid backup to keep on hand.

Was a bit skeptical about the protection circuit adding bulk, but it slides into the tube just as easily as my old cell. The 1100mAh rating holds up well for a full evening of use, and the charge indicator on my charger shows it topping off cleanly. Just wish I'd bought two from the start.

Fits my light perfectly and the 1100mAh capacity means I can swap in a fresh one mid-hike without worrying about dying on the trail. The protection circuit gives me peace of mind when I toss it in my bag.