21700 batteries represent a significant advancement in the field of rechargeable lithium-ion batteries, originally popularized by their use in electric cars and scooters. As the designation “21700” suggests, these batteries measure 21 millimeters in diameter and 70 millimeters in length. This is a noticeable size increase over the more commonly known 18650 batteries, which measure 18 millimeters in diameter and 65 millimeters long.
The primary advantage of 21700 batteries over their predecessors is their increased energy capacity. While an 18650 battery typically maxes out at about 3,600 milliamp hours, a 21700 battery can hold up to 5,000 milliamp hours. This increase in capacity allows for much longer run times without necessitating a significant increase in physical size, maintaining compatibility with devices designed for 1-inch body tubes.
Several manufacturers have embraced this new battery technology. For instance, Nitecore has released a range of 21700 battery-powered flashlights, including models like the new P12, new P30, HC35, E4K, and I4000R. These flashlights leverage the extended capacity of 21700 batteries to offer enhanced performance and longer operational periods between charges.
For those looking to charge 21700 batteries, there are several options on the market. Budget-friendly USB chargers like the UI1 and UI2 are readily available. For those preferring a fully digital experience, chargers like the UMS2 and UMS4 are designed with bays large enough to accommodate the extra length and width of 21700 batteries. An even more convenient option is the NL2150R battery, which features a built-in USB-C charging port and comes standard with models like the E4K and new P30.
FAQs
Q1: What makes 21700 batteries different from 18650 batteries?
A1: The main difference lies in their size and capacity. 21700 batteries are slightly larger (21 mm in diameter and 70 mm long) than 18650 batteries (18 mm by 65 mm) and offer a higher energy capacity, up to 5,000 milliamp hours compared to 3,600 milliamp hours in 18650 batteries. This allows for longer usage times on a single charge.
Q2: What devices commonly use 21700 batteries?
A2: 21700 batteries are commonly used in high-performance devices such as electric cars, scooters, and high-intensity flashlights. They are preferred for applications that require extended battery life and high energy output.
Q3: Are there special chargers required for 21700 batteries?
A3: Yes, due to their larger size and increased capacity, 21700 batteries often require chargers with larger bays and enhanced charging capabilities. There are several chargers specifically designed for 21700 batteries, including models with built-in USB-C ports for convenience, like the NL2150R, which allows for direct charging of the battery without the need for a separate charger.
For those who are familiar with or interested in 18650 batteries, consider the Sunpower New Energy 18650 battery, renowned for its high quality, competitive pricing, and lower minimum order quantities. With over ten years of manufacturing experience, Sunpower New Energy provides reliable and efficient energy solutions, making their batteries ideal for a variety of devices. Alongside the newer 21700 batteries, which offer longer run times and enhanced capacity in compact and efficient designs, Sunpower New Energy’s 18650 batteries ensure cost-effective energy storage for both everyday and specialized equipment, embodying a significant advancement in battery technology to meet modern energy needs.