/technologies/power-management/b/blog/posts/maintentance-measurements-and-lithium-ion-batteriesWhenever you visit a shopping center or cinema or basically any public building you might notice illuminated emergency exit signs telling you the way out in case of an incident. As such an incident might cause the mains power supply to stop working, en-USTelligent Community 12https://community.element14.com/technologies/power-management/b/blog/posts/maintentance-measurements-and-lithium-ion-batteriesSun, 20 Jun 2021 16:26:03 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6b3c4e7e-24a3-4fea-80f6-71bf659db4b8three-phase0<p>Many thanks for adding more detail regarding EIS. As I said, when I briefly touched on it in one of my blogs, I am aware of the technology, but have never seen it used out on a site. The original Ebite system we used to use to measure battery impedance with was a mains powered unit. It was so much easier testing after moving to the battery powered Hioki 3550 HiTester and now the BT3554.</p><p>&nbsp;</p><p>Do Hioki have any recommendations for Nickel Cadmium wet cells, I am starting to see them more now in standby battery banks and from what I have read impedance testing is complex due to temperature variations?</p><img src="https://community.element14.com/aggbug?PostID=11469&AppID=4&AppType=Weblog&ContentType=0" width="1" height="1">