Check out Keysights Automotive Cybersecurity videos: https://keysig.ht/1fPZoZ
Previous video: https://youtu.be/XOcA7ijtlCY
Photovoltaic Off-Grid System video: https://youtu.be/WU16AJwvNhE
LiFeYPO4 Battery Pack video: https://youtu.be/ewkj875qUmk

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You can get the shown battery tester + batteries here: (affiliate links)
Aliexpress:
Capacity Tester: https://s.click.aliexpress.com/e/_ACkbW5
Internal Resistance Tester: https://s.click.aliexpress.com/e/_AY6d1j
12V 100Ah LiFePO4 battery: https://s.click.aliexpress.com/e/_AoMrtF
Amazon.com:
Capacity Tester: https://amzn.to/39ArSIP
Internal Resistance Tester: https://amzn.to/3QCmmq2
Amazon.de:
Capacity Tester: https://amzn.to/3tORtot
Internal Resistance Tester: https://amzn.to/3A5rKMz
12V 100Ah LiFePO4 battery: https://amzn.to/3HAwCe0

In this video I will be having a closer look at the battery of my solar off-grid garage in order to find out whether it is still working perfectly fine or needs to get replaced. The battery is a LiFeYPO4 type but during the video I will also include Li-Ion and LiPo batteries and show you exactly how you can test their capacity and internal resistance in order to determine if they are still good to go. These tests are of course also suitable for all other battery types which means you will be the "master" tester for all of them after finishing this video ;-) Let's get started!

Websites which were shown/mentioned in the video:
http://www.zketech.com/nd.jsp?id=14#_np=101_304
https://files.gwl.eu/inc/_doc/attach/StoItem/1580/ThunderSky-Winston-LIFEPO4-100Ah-TALL-Datasheet.pdf
https://www.statista.com/statistics/1267541/germany-monthly-wholesale-electricity-price/
https://www.amperetime.com/collections/ampere-time-12v-lithium-lifepo4-battery-series/products/ampere-time-12v-100ah-lithium-lifepo4-battery
https://www.nothnagel-marine.de/media/downloads/Lithium_Akkus/Manual%20WB-LYP100AHA%20Winston-Lithium-ion%20Batterie.pdf
https://www.electronicdesign.com/technologies/test-measurement/article/21128843/keysight-technologies-measuring-dcir-of-lithiumion-cells
https://batteryuniversity.com/article/bu-902-how-to-measure-internal-resistance
https://lygte-info.dk/info/Internal%20impedance%20UK.html

Thanks to Keysight for sponsoring this video.

0:00 Is my Big Battery Pack still good to use?
1:34 Intro
2:06 Capacity of a Battery Explained
3:44 How to measure the Capacity
7:04 Internal (DC) Resistance Explained
8:04 Measuring the Internal AC&DC Resistance
9:43 Boombox Li-Ion Battery Test
10:19 Verdict