https://stream.echo6.co/videos/watch/169cf661-3461-4d23-91c3-4d42855de07d Check out Keysights Automotive Cybersecurity videos: https://keysig.ht/1fPZoZ Free Altium Designer Trial: https://altium.com/yt/greatscott! (AD, Paid Promotion) Previous video: https://youtu.be/XOcA7ijtlCY Photovoltaic Off-Grid System video: https://youtu.be/WU16AJwvNhE LiFeYPO4 Battery Pack video: https://youtu.be/ewkj875qUmk Facebook: https://www.facebook.com/greatscottlab Twitter: https://twitter.com/GreatScottLab Instagram: https://www.instagram.com/great.scott.lab/ Support me for more videos: https://www.patreon.com/GreatScott?ty=h 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 Wed, 15 Apr 2026 11:30:04 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/169cf661-3461-4d23-91c3-4d42855de07d All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.