The LSD Vapextech batteries discharge at a much slower rate than conventional NiMH batteries, so even a year after being charged there is still lots of the initial charge available. You get the benefits of traditional NiMH rechargeable batteries, without the drawbacks , you can still use a standard NiMH charger to charge them up again. So its like having a Alkaline battery that you can charge! They have a life cycle of over 1000 charges. The batteries are supplied charged, so can use them straight after purchase, however, some charge can be lost so a top up charge is recommended pre use.