Battery Experience

Author	Message
Revlac Guru Joined: 31/12/2016 Location: Australia Posts: 1214	Posted: 10:13am 04 Mar 2022       With hindsight, getting the proper gear to test the cells would have been the best approach, I might have discarded a lot more cells.   Quote   All good and well but as they are usually from failed packs and the failed cells removed, How does one know more cells wont fall over in a month and do many fall over within a year or so of being re purposed and tested? With the unknown brand 18650 cells, Found in a few knock off drill battery packs, some cells had failed, others all have failed, didn't like the look of them and never used any of them, Battery brand and quality (with any battery type) vary widely so I don't paint them all with the same brush, so to speak. I never did any capacity mapping, and We don't know how many cells would fall over, and when. The percentage of failed 18650 cells (cause of death unknown in the notebook packs) was only small and was not an indication that the others would fall over next  compared to the rest that worked, By now I'm sure there is some cells in there (developed high resistance) that are not doing there job, but as it was running the house easily with power to spare I don't think I'm going to do any capacity checks and it might be a lot of extra work to find those cells that might not be working as good as they should,  when it isn't up to the task of running what I want it to, then I will know. Think it will go another year in the shed. I would like to see what these do at the end of there life, will they have a high resistance short, or will they develop high resistance and go open circuit. Initially I was worried about the entire setup getting hot while charging and in use, (as they do in note books and drill batteries and others etc, but that hasn't been the case, Off grid use was easy on them.   Quote   BE happy if I could Find some Decent used lead batteries or had a friend in the game somewhere. I was going to suggest the following-----> You might be lucky and find someone working on an NBN installation (have a chat) Think they have battery back up, also I believe the towers also had battery backup, They are most likely going to lithium soon if they haven't already, I looked up Telecom batteries and saw a plethora of it. Now I'm Not so sure if they all still use battery backup, Thursday morning the local area and farms, is without power and the phone towers Didn't work, later on towers are working again, unknown what happened, every one else still had no power, all running generators, those who have one, power back on Friday morning. I don't have any power problem. I might do some updates later if anything change and when I finish rewiring the battery setup in the shed.