October 22, 2021
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In-vehicle Battery Test by Foxwell BT100 Battery Analyzer

A quick introduction about Foxwell BT100 Battery Analyzer:

BT100 12 Volt Battery Analyzer from Foxwell is dedicatedly developed to test 12V regular flooded, AGM flat plate, AGM spiral, and gel batteries. It provides a quick, easy, and affordable solution for technicians to view battery charging status, check battery health, and detect faults.

OK, it’s my show time to tell you guys how to do tests for In-vehicle Battery with BT100. Let’s walk through this test together!

Detailed Testing Instruction:
First, let’s check the car battery type and its rating label.

It’s a regular acid battery and “CCA 550” is shown on the nameplate.
Do keep that in mind during the whole test.
Hook up the red lead to the battery positive post and black lead to the battery negative post. Relevant pictures as follows:



Go to the “Main Menu”>>Select “Battery test”>>Select “In Vehicle”(the battery is still attached to the car)



Next, it will jump to “BAT.TYPE” menu, which means you have to choose your car battery type. Here, press “Regular” to continue.
It will ask you to choose the battery standard such as “CCA, CA, MCA, JIS, etc.”
Here, let’s select “CCA” to continue. It will show the “RATING” of “550 CCA”, which is the same as that of the nameplate.


Press the “Enter” button to start testing. Then the Testing Result will be displayed on the device’s screen in detail.
It tells me I have to “REPLACE BATTERY” because the measured CCA is 446 lower than 550 CCA, and the value of SOH(State of Health) is 68%. This is such a low percentage that I don’t have a choice but to replace the battery.