good, fast delivery in 1 month, AAA is fitting in to D adapter
They works. Plastic case is strong and 3 batteries are better than 2 or 1 because it last longer. I used 6 x rechargeable aaa with aaa to aa adaptors, and put them into 2 of these 3 AA to D adaptor. It works for my flashlight but of course the light is fainter than 2 real D size battery. For emergency, it is totally fine. My flashlight is served as emergency light source. If I used D alkaline batteries, there are chances that they leak if left inside the flashlight for long time and ruin the device. Rechargeable batteries do not leak. I don't want to buy rechargeable D because they are expensive, need special charger, and are useless other than powering my old flashlight. Also, I already have lots of rechargeable AA/AAA and charger that works for them. That's why I bought these. After all, I am happy.