USB/Rechargeable Lights

Advances in technology means that rechargeable bike lights have really moved on in the past few years - most bike light companies now offer USB rerchargeable lights which means that you can cycle to work and then plug into your work computer to recharge you batteries - no more paying through the nose for copper-topped AA's! There are three amin ways that you can buy re-chargeable lights. 1. Those lights that take rechargeable AA batteries (there are even USB rechargeable AA's!), 2. Lights that have separate rechargeable battery packs that can be removed from the bike and rercharged at your leisure. 3. Bike lights which have sealed-in batteries that can be recharged vie mains or USB power.