AAA to AA Battery box Converter Adapter Battery Size Converter Case Switcher Product AAA to AA battery converter, AA battery is used as AA battery. The positive and negative electrodes are protected by rust-proof n ickel plating on the outside of pure copper fittings Super conductive performance, no rust The No. 7 to the No. 5 tube can use the No. 7 battery as the No. 5 battery. The material is made of PP material with good toughness, which is not easy to crack. The barrel wall is also thickened, making it more solid and durable. The positive pole has also been improved compared to the old model, and the positive pole has become taller and narrower to ensure good contact with circuits on various electrical appliances. The positive and negative poles of the conversion cylinder are designed with dual hardware, n ickel-plated, which is reliable and durable. The negative pole has a cylindrical shape with a protruding pillar, so that the AAA battery is reliably fixed in the barrel to ensure easy use. The improved combination of the two ends of the barrel adopts a card slot, which is very scientific and reasonable. Compared with the conventional forced friction bonding method, the bonding is tighter and stronger, and the thickness of the cylinder will not be cracked due to the tight bonding. Products include: 12pcs No. 7 to No. 5 AAA to AA battery converter battery canister