Originally Posted by
hubcap
Lezyne's lights use 18650 cells that are easily removed so they can be replaced with fresh ones if you won't be able to recharge them for a while or will be doing some endurance type ride. You can also plug a USB charger right into the light to charge the batteries without removing them if you choose. Best of both worlds.
This is a very nice feature with the Lezynes, and would probably tilt me in that direction if buying a self-contained headlight right now. Their actual run times are no better than Light & Motion or Niterider lights, but the ability to carry spare batteries is a real plus if you need to extend usage time.