2 | Buying rechargeable is cheaper over time
Rechargeable flashlights and headlamps are more expensive to buy than their alkaline counterparts. However, over time the rechargeable light becomes the cheaper choice.
It costs €2 for 1 battery change with a standard alkaline headlamp using 3xAAA batteries, giving you roughly 2,5 hours of light. If you switch batteries once a week for a year, the battery expenses run up to €109,20! In comparison it costs less than €1 to charge an S4 rechargeable once a week for a year.
It might also be worth mentioning that a S4 rechargeable costs €103,50 on the Suprabeam webshop, which is less than the yearly alkaline battery cost.