Great product! It can replace the "Big" LR20 batteries with LR06 most common rechargeable batteries model today. With the power of LR06 NiMH rechargeable batteries until more than 2500 mAh, it is possible to use them in devices hungry LR20 batteries (1500 to + 3000 mAh). Tested on small motor and lamp, its ADAPTOO adapters effectively do their office! A product that I recommend!