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9V Battery, commonly known as "layer-built battery", gets its name because its internal structure consists of 6 miniature sheet batteries stacked together. It is also named PPP3 battery, with a nominal voltage of 9V (the actual factory voltage is slightly higher and gradually decreases with use). Its size specifications are a width of 26.5mm, a thickness of 17.5mm, and a height of 48.5mm. Depending on the electrolytic substances, the main types include one-time-use 9V batteries such as lithium battery (lithium 8.4v), carbon-zinc 6F22, alkaline 6LR61 (Alkaline), and secondary 9V batteries composed of nickel-metal hydride (Ni-MH) and nickel-cadmium (Ni-Cd). It is mainly used in transistor radios (early products), walkie-talkies, remote-controlled toys, smoke alarms, wireless microphones, multimeters and other electronic and instrument products. The main advantage of this battery is that it can provide a relatively high working voltage for devices in a compact structure.

According to the ANSI standard, the width of this kind of battery is specified as 26.5 millimeters, the thickness as 17.5 millimeters, and the height as 48.5 millimeters. There are one-time non-rechargeable ones and secondary rechargeable ones. The picture shows various specifications of 9V batteries.

9V Carbon-Zinc Battery (6F22): The 9V carbon-zinc battery, also known as the 6F22 layer-built battery, is formed by stacking 6 small oval sheet batteries, which can make the best use of the battery space. Since it is an ordinary carbon-zinc battery, to evaluate its discharge performance, it is better to place it in an actual usage environment to better illustrate its performance. It is suitable for low-current and intermittent working environments. This kind of battery may leak after long-term use. In the following pictures, one picture shows the discharge effect diagrams of the 9V carbon-zinc battery under three different discharge conditions, which illustrates the working environments it is suitable for; the other picture shows three different combinations. On the left is the carbon-zinc 9V battery composed of 6 F22 model cells, in the middle is the 9V alkaline battery 6LR61 composed of 6 LR41 batteries stacked together, and on the right is the 9V battery composed of 6 columnar alkaline AAAA batteries. Different compositions and cells have significant differences in discharge and storage.

9V Alkaline Battery (6LR61): The 9V alkaline battery, also known as the 6LR61 battery, has two forms of composition, as shown in the figure. Under heavy-load discharge conditions, the performance of alkaline batteries is superior to that of carbon-zinc batteries. The storage time of the layer-built battery structure is about 1 - 3 years, while that of the columnar structure is a bit longer, approximately 3 - 5 years.

9V Nickel-Metal Hydride Secondary Battery (23F6-220): 9V nickel-metal hydride batteries are divided into 9V round batteries and 9V square batteries and have two forms of composition, as shown in the figure. Usually, they can be cyclically charged more than 500 times, have a longer service life than carbon-zinc batteries and alkaline batteries, and are environmentally friendly. They are widely used in toys, remote-controlled cars, and remote-controlled airplanes.

Nominal Capacity: 250mAh, Nominal Voltage: 8.4V
Cycle Life: ≥500 times, Weight: approximately 55g
Storage Temperature: -20℃ ~ 35℃, Discharge Temperature: -20℃ ~ 60℃
External Dimensions: MAX 26.5 * 16.8 * 48.5
Charging Method, Charging Current, Charging Time, Charging Conditions
Standard Charging: 25mA (0.1C), 15 hours, Environmental Temperature: 20 ± 5℃, Relative Humidity: 65 ± 20%
Fast Charging: 250mA (1C), 1.2 hours, -ΔV = 5 - 10mV, -dT/dt = 1.0 - 3.0℃/min; Termination Temperature = 50℃ (122°F); Environmental Temperature: 20 ± 5℃, Relative Humidity: 65 ± 20%

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