u/Familiar-Image1479

Hello! I recently finished a 42v battery pack, 10s4p using samsung 58e cells. Pack is well balanced, and I spent a lot of effort building it properly with saftey my number one concern at all steps. The charger I have is a 42v 2a charger. The first charge cycle I charged to 41.5v. I noticed a significant voltage drop after this. Drops about .3+ volts. I understand voltage drop can be normal. My charger does ramp down the amps, but doesnt start doing that till the pack reaches roughly 41.7 volts. To counteract this I tried setting the overprotection limit to 4.18, and having it drop to about 41.5v. This charge cycle I did 41.7 and now it is at 41.33. For my use case this is absolutley fine, and if I have any particular use for the full capacity on any given cycle I will increase it. My questions are should I be concerned about the voltage drop? Is it harmfull to let the overvolt protection of a jkbms dictate when I want the charger to stop, rather than having that as a backup if the charger doesnt shut off? And lastly I read charging your cells to 4.15 instead of 4.2 extends the life a good amount, obviously going lower that 4.15 is even better, but I also want to get the capacity I need while lengthening its life. So will charging it to 4.18, and having it drop to 4.15 have the downsides of charging to 4.18, even though it drops to 4.15? Or will it have the life cycle benefits of charging to 4.15? I know the real solution would be to get a charger that I can dial the voltage up or down as needed, so I am considering that depending on the awnsers to my questions.

So I guess I will start this off saying my brother has always had mild autism, atleast thats what the doctors say, but it still seems more extreem than a lot of people I know. Growing up he would throw fits, and get into trouble, my parents always wanted me to not react/ would give him what he wanted so he would not freak. As an adult he has only ever had one real 9-5 type job and he only worked there for a very short time as a teenager. My dad helped him a lot, my dad has spent a ridiculous amount of money on him in fact. He got him a house in the hopes he could find a way to live there after my folks pass and he wont have any more support. There is much more to that story but I don't want to post anything too detailed. Over the years he keeps growing more greedy wanting more and more out of my dad. Im worried my dad is finished financially because of everything that has happend. This year my brother essentially managed to lose all of his money. This sent him into a massive tailspin. He started doing a lot of drugs. Over time he has shown skitzophrenic traits but nothing that made it distinct. Recently this has changed, he gradually became more paranoid about different things in his life, and it came to a head. He had a full on pshychotic break. It was sad cause he called me really concerned wanting to get help, right before the worst of it hit. That being said while he has gotten sober and taken help in the past he is very anti medication. He got on a med a year ago for a while after he had been sober a long time, but was very particular about the type of med. He is exteeemly against stuff like ssri's or anti-pyshotics. Right now he wont take anything let alone get help. Anyways he entered this full on pshycotic break and was getting driven to my moms (long distance from where he lived), he got out of the car and started walking around the highway, I think on the side of the highway? But nontheless it was nuts, he thought everyone was an alien or something and would not get in the car. He ended up in a hardcore pshyciatric unit, which he did not like. He kept making a fuss about it, and basically manipulated his way out of there. He was supposed to go striaght to a better treatment facility afterward but my mom let him into the apartment and that was that. He is still nuts, paranoid, but not full on pshycotic. I have been living at my moms for the past year almost to save money while im advancing in my career. He has always been lazy and short fused, the two things that bother me most. He will make a mess everywhere then yell at my mom for the smallest things. Its like he is incapable of doing anything productive or helpfull to another human being. I got into a massive fight with him last week because he was screeming at my mom and made some agressive movements twoards her, when I stepped in he did the same to me and I lost my cool and punched him out a little bit. Things have calmed down since then and he screams less, but he still makes a lot of messes, all his clothes, plates, will shave and not clean it up, leave all the cabinets open. Literally like a toddler. Its at a bad time for me cause I spent money on some nice things recently that maybe I should have saved up, cause I gotta get out of this house if he stays here. Other than his drama this year has been the best for my life in general. Just kinda want to be done with him, if he gets better like 150% better then that would be great but other than that It is like he is a zombie.