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Check out Keysights Automotive Cybersecurity videos: https://www.keysight.com/us/en/learn/course.automotive-cybersecurity-everything-you-need-to-know.html Free Altium Designer Trial: https://www.altium.com/asp/youtube Previous video: https://www.youtube.com/watch?v=XOcA7ijtlCY Photovoltaic Off-Grid System video: https://www.youtube.com/watch?v=WU16AJwvNhE LiFeYPO4 Battery Pack video: https://www.youtube.com/watch?v=ewkj875qUmk Facebook: https://www.facebook.com/unsupportedbrowser Twitter: https://twitter.com/GreatScottLab Instagram: https://www.facebook.com/unsupportedbrowser Support me for more videos: https://www.patreon.com/GreatScott 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://www.amazon.com/T-king-Capacity-Dischage-Electronic-EBC-A20/dp/B07V7BGWFW?language=en_US Internal Resistance Tester: https://www.amazon.com/T-king-Internal-Resistance-Precision-Analyzer/dp/B07SBSQG4T?language=en_US Amazon.de: Capacity Tester: https://www.amazon.de/DiLiBee-Batterietester-Multifunktion-Batterietestger%C3%A4t-Batteriekapazit%C3%A4tstester/dp/B09X5DMXZ5?language=de_DE Internal Resistance Tester: https://www.amazon.de/VBESTLIFE-Batterie-Innenwiderstandstester-Lithium-Polymer-Lithium-Eisen-Phosphat-Trockenbatterie-default/dp/B083V2B8C1?language=de_DE 12V 100Ah LiFePO4 battery: https://www.amazon.de/Autobatterie-Batterie-Wohnmobile-Overland-Off-Grid/dp/B0B12TXTBG?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&language=de_DE 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-lithium-ion-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