This rechargeable battery Li-ion from LedLenser (I 9R) 2,4V 4Ah is efficient and is made of high-quality material. This batt is friendly for the environment. LedLenser is a Zweibrüder brand. They manufacture a wide range of torches, headlamps and diving lamps featuring the latest LED technology as well as, in most cases, the Advanced Focus System, one of the best focusing systems available.