UltratFire 1800mAh Protected 18650 / 18670 Li-ion batteries with internal circuit protection also known as (PCB- printed circuit board), PCM (power control module), or IC (internal circuit) which are all terms that indicate the cell has an electronic circuit designed to create an open circuit when design specification values of current or voltage are exceeded. This circuit is located at the negative end of the battery concealed by the PVC shrink wrapping. These batteries are sold individually.

Capacity of these cells have been tested by e-lectronics at .7Amp load and measured 1800mAh (+/-50mA). Note that industry standard is to test at .1C which would be 240mA although e-lectronics tests are performed at higher, more realistic load conditions. See below for a graph of a discharge performed on one of these cells at .7A, this particular discharge cycle was 1825mAh. 

NOTE: These batteries batteries are marked as 2400mAh although e-lectronics is advertising them as their true tested capacity of 1800. They do have raised positive terminals, no spacers or magnets are required.

Lithium Ion batteries must only be charged with an approved Li-ion charger and should be charged in a fire proof environment. Damaged cells should be disposed of. Mis-handling of li-ion cells may result in fire or explosion.

These protected batteries are not well suited for building packs or rebuilding laptop batteries. If you are looking for Lithium Ion batteries for packs or rebuilding laptop batteries please click here to view these batteries at ALL-Battery.

Operating Specifications:

*- Length and diameter were determined by a random sampling of cells, this table represents the largest measurements from this sampling.