No.
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No, licking a AA battery will not extend its life. In fact, it can be dangerous as it can cause a short circuit and harm your tongue. It's best to handle batteries carefully and not expose them to moisture or unnecessary contact.
Yes, a AA battery typically provides 1.5 volts, so you would need to connect multiple AA batteries in series to reach 12 volts. For example, connecting eight AA batteries in series would provide a total of 12 volts.
A standard alkaline AA battery typically supplies about 1.5 volts of electrical potential. Rechargeable AA batteries, such as nickel-metal hydride (NiMH) or lithium-ion, usually provide around 1.2 volts when fully charged.
A single AA battery will produce 1.5 volts. In series the voltage is additive. In parallel the voltage remains the same but the batteries total capacity is increased.
The watt-hour rating of an AA battery can vary depending on the specific battery brand and type. On average, a standard alkaline AA battery has a capacity of around 2.6 to 3 watt-hours. However, it's important to check the specific specifications of the battery in question for an accurate measurement.
One can buy an AA charger from shops like Currys, Comet, BestBuy. Even some off the superstores like Tesco, Wallmart, ASDA stock AA chargers. It's better to go for AA chargers which show charging indication and auto-cut off once the batteries have been charged, make sure that you use the right battery with correct charger rating.