4500 battery refers to a specific size of rechargeable lithium-ion batteries. The “14500” designation indicates their dimensions: 14mm in diameter and 50mm in length. These batteries are roughly the same size as standard AA batteries, but there are important distinctions between the two:

Voltage: A standard 14500 lithium-ion battery typically has a voltage of 3.7V when fully charged, which is higher than the 1.5V of a standard alkaline AA battery. This means you can’t simply replace AA batteries with 14500 batteries in any device without making sure it’s compatible with the higher voltage. Doing so might damage the device.
Capacity: 14500 batteries will typically have a lower capacity (measured in milliamp-hours or mAh) than AA alkaline batteries. This means that, depending on the application, a device might run for a shorter time on a 14500 battery than it would on an AA battery.
Rechargeable: 14500 batteries are rechargeable, whereas standard AA alkaline batteries are not. However, there are AA-sized NiMH (Nickel-Metal Hydride) batteries that are also rechargeable.
Chemistry: 14500 batteries use lithium-ion chemistry, whereas AA alkaline batteries use an alkaline chemistry. There are also other types of AA-sized batteries, like NiMH, which have different chemical compositions.  14500 vs AA Battery
If you’re considering using 14500 batteries as a replacement for AA batteries in a device, make sure to check the device’s specifications and requirements first to ensure safety and proper operation.