Lithium-ion Batteries

AAA-sized lithium-ion. Much higher voltage than AAA alkaline - verify compatibility. Name comes from dimensions: 10mm diameter × 44mm height. Direct AAA size replacement but with 3.7V instead of 1.5V.

Compact lithium-ion cell roughly 2/3 the length of a 14500 (AA-sized) battery. Popular in applications where space is extremely limited but AA batteries don't provide sufficient voltage. Less common than other formats, so availability and quality can vary significantly between manufacturers.

AA-sized lithium-ion. Higher voltage than AA alkaline - check device compatibility. Name comes from dimensions: 14mm diameter × 50mm height. Direct AA size replacement but with 3.7V instead of 1.5V.

Rechargeable lithium-ion equivalent to CR123A primary batteries, but with higher nominal voltage (3.7V vs 3.0V). Popular in high-drain devices like tactical flashlights. The '16340' designation comes from dimensions: 16mm diameter × 34mm height. Protected versions with built-in safety circuits are strongly recommended for consumer use.

Compact lithium-ion cell, exactly half the length of an 18650. Popular in tactical flashlights and devices requiring high current in a small package.

Shorter version of the popular 18650 format, offering a more compact size for applications where space is limited. Popular in tactical flashlights and devices where 18650 is too long but AA batteries lack sufficient voltage or capacity.

Most popular lithium-ion format. Name comes from dimensions: 18mm diameter × 65mm height. Maximum commercial capacity as of 2024 is 3600mAh. Widely used in consumer electronics and electric vehicles.

Larger capacity alternative to 18650 with higher current handling. Popularized by Tesla's use in Model S/X vehicles. Offers good balance of capacity and power density for high-drain applications.

Successor to 18650 format with significantly higher capacity. Name comes from dimensions: 21mm diameter × 70mm height. Maximum commercial capacity as of 2024 is 6000mAh. Preferred format for Tesla and many EV manufacturers.

Large format Li-ion with very high capacity and current capability. Name comes from dimensions: 26mm diameter × 65mm height. Higher capacity and current than 18650/21700.

Large format cylindrical cell popular in energy storage applications. Available in both standard Li-ion and LiFePO4 chemistries. LiFePO4 versions offer longer cycle life and enhanced safety.