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2. List of battery types - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_types

   A Duracell AA size alkaline cell, one of the many types of battery. This list is a summary of notable electric battery types composed of one or more electrochemical cells. Three lists are provided in the table. The primary (non-rechargeable) and secondary (rechargeable) cell lists are lists of battery chemistry.

3. Nickel–metal hydride battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–metal_hydride_battery

   NiMH batteries have replaced NiCd for many roles, notably small rechargeable batteries. NiMH batteries are commonly available in AA (penlight-size) batteries. These have nominal charge capacities (C) of 1.1–2.8 Ah at 1.2 V, measured at the rate that discharges the cell in 5 hours.

4. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   Left to right: 3x AA to D parallel battery converter with rechargeable NiMH AA-size batteries inserted. MY DAY vintage flashlight. It uses 1.5 V D-size batteries. Sofirn SP36 flashlight. It features a 5 V 2 A USB-C charging port to load 3.7 V 18650 rechargeable lithium-ion batteries. The most common power source for flashlights is the battery.

5. Electric battery - Wikipedia

   en.wikipedia.org/wiki/Electric_battery

   Secondary batteries, also known as secondary cells, or rechargeable batteries, must be charged before first use; they are usually assembled with active materials in the discharged state. Rechargeable batteries are (re)charged by applying electric current, which reverses the chemical reactions that occur during discharge/use.

6. Nickel–iron battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–iron_battery

   Edison's batteries had a significantly higher energy density than the lead–acid batteries in use at the time, and could be charged in half the time; however, they performed poorly at low temperatures, and were more expensive. Jungner's work was largely unknown in the US until the 1940s, when nickel–cadmium batteries went into production there.

7. Nine-volt battery - Wikipedia

   en.wikipedia.org/wiki/Nine-volt_battery

   In the PP3 size they are typically rated at 0.8–1.2 Ah (e.g. >1.2 Ah @ 900 ohms to 5.4 V @ 23 °C for one type), [19] about twice the capacity of alkaline batteries. Some manufacturers claim the energy density can be five times that of alkaline. [19] Common applications for lithium nine-volt batteries are smoke and carbon monoxide detectors. [6]