Using this battery holder is easy. First, open the holder and insert your AA batteries. You can choose either Alkaline AA batteries for more power or rechargeable NiMH batteries for a lower - voltage option. Connect the 5.5mm/2.1mm plug to your electronic device that has a 5V voltage regulator. Remember, this device requires a 7V+ supply. As for the batteries, they're not included, so you'll need to buy them separately. When it comes to maintenance, keep the battery holder clean and dry. If you're using rechargeable batteries, make sure to recharge them regularly according to the battery's instructions. And always handle the batteries and the holder with care to avoid any damage.
