# What is the Total Equivalent Lithium Content of My Battery?

If you ever were curious to know just how much of the chemical, lithium, was packed into your battery then there is a way you can calculate it.

Let's look at an example, say the HP Compaq 367759-001, we know that this battery has the following technical specifications: 10.8V, 8800 mAh, Li-ion.

So now let's determine the ELC for one of the cells in this battery. As stated above the rated capacity is 8800 mAh. The mAh is the milliamps and so if we convert that to Ah or amp hours in order to do our calculation you get 8.8 Ah (8800 mAh is the same as 8.8 Ah).

Secondly, we need to divide the voltage by of the battery by the known voltage of each cell used in the battery. Most batteries use either a 3.6V or a 3.7V cell. In the HP Compaq 367759-001 battery cells have a 3.6V.

Finally we can complete our effort in knowing the total ELC in the 367759-001 by performing the following…

1. Divide the stated volts (V) on battery pack by 3.6 (or 3.7) and round to the nearest whole number. 2. Multiply the resulting number by the stated capacity in ampere-hours (Ah).
3. Then multiply that result by 0.3

Example: A lithium ion battery with 10.8 (V) and 8.8 ampere hours (or 8800 mAh).

1. 10.8 ÷ 3.6 = 3
2. 3 x 8.8 = 26.4
3.  26.4 x 0.3 = 7.92 grams of equivalent lithium content

To determine the amount of ELC in your battery follow the steps above and just input the technical specifications of your battery.

Until next time, Dan Hagopian – www.batteryship.com