I use Eneloops in my Led Lenser P7. It hangs by the back door as an emergency light and very rarely gets used because I have many ‘better’ lights in my collection. Alkaline batteries are out of the question because of leakage issues over time so Eneloops are the ideal rechargeable battery due to the fact that they retain most of their charge for a couple of years, don’t leak, are readily available and cheap. Highly recommended.