'Fenix'. I double checked the post dates on this thread to make sure this wasn't an old discussion. Anyway, this BC21R bicycle headlamp model has been on the market for almost two years. The user can replace a depleted 18650 cell with a fresh one and either recharge cells used separately or in the light housing via USB. Improved beam shape, side lights, four brightness levels, last level memory, flashes if that's your thing, charge level indication, over temp protection, limited lifetime guarantee.