Knowledge Base

Li-ion Design Resource

Calculating Battery Runtime

Battery runtime can be calculated using 1 of 2 methods, dependent upon the type of load the host equipment is placing on the battery. Constant Current Load If a battery…

Secondary Protection Devices

PTC (Positive Temperature Coefficient) / Polyswitch A PTC functions as a resettable fuse, offering over current protection without permanently disabling a battery pack for future use. A PTC is essentially…

PCMs

Li-ion has become the chemistry of choice for many industries due to its high energy density, remarkable cycle life and high charge and discharge rates. Li-ion cells, partly due to…

Series and Parallel Cells

Battery packs are often described in ‘S’ and ‘P’, for example 6S1P or 3S2P are two common battery pack configurations. Both of these examples are actually made up of the…

Li-ion Cell Internal Safety Features

Cylindrical Cell Construction: Figure 1 show the standard construction of an 18650 Li-ion cell. There are 3 main safety features; the PTC, the CID and the Pressure Relief Valve. PTC…

How to Safely Charge Li-ion

Charge Profile Li-ion cells follow a simple 2 stage charge regime; CC (Constant Current) and CV (Constant Voltage), cells must not be ‘trickle charged’ at a low current as per…

Understanding Li-ion Cell Sizes

Unlike traditional Alkaline cells, most Li-ion cells do not use the AA/AAA/C/D sizing convention that many consumers are accustomed to. Li-ion cells use a metric system to define their size,…