I do agree with repairing a stock battery from Milwaukee, DeWalt, Craftsman and Ryobi. However, those packs will have an actual BMS to protect every cell and to balance them out. The pack you have repaired does not have a bms and that makes that pack an extreme fire hazard. That's why there are so many battery fires! Packs from Amazon are fakes and rarely even have a bms. There is a girl on youtube forgot her name, but she was given several Makida batteries and found one that was in the process of thermal runaway and threw it outside where it eventual bursted into flames!
Thank you for your well intended warnings. Lithium based batteries are potentially very dangerous, especially when over-heated, over-charged, over-discharged. or physically damaged. They certainly scare me. I cannot answer for whether any of my batteries have a "real" BMS. And there have also been name-brand batteries that have been recalled.
Hey mate, couple things to note. When you replace individual cells you want to match the capacity to the old cells. Ideally you would want to replace every cell so they are closely matched, voltages of every cell need the be matched in the pack as well. Having 2 cells higher capacity then the rest will cause balance issues within just a couple charge cycles and may kill the rest of the pack in a short periods of time. I did notice your cells are already badley balanced when you assembled the pack so unfortunately there's already a issue. As for spot welding, the nickel strip on the battery has a slit in it, you ideally want to have this slit inbetween your probes as it allowes the current to flow through the battery cap and not just across the top of the nickel. I do apologise for stamping down your success but unfortunately your method is unsafe but I do understand that we go into things sometimes with not enough knowledge and don't know it! One other note, your charger, get a proper charger, you should not have been seeing more then 4.2V when you checked it with your Multimeter, very concerning. If you want any suggestions on brands etc feel free to ask! Otherwise great video :)
Thank you for your polite and sensible criticism. I was fairly aware of the balance concerns on the batteries. I have a similar concern on my Ryobi mower batteries. Slitting the strips makes a lot of sense. I should have figured that out when seeing the slits in the existing "strips".
I do agree with repairing a stock battery from Milwaukee, DeWalt, Craftsman and Ryobi. However, those packs will have an actual BMS to protect every cell and to balance them out. The pack you have repaired does not have a bms and that makes that pack an extreme fire hazard. That's why there are so many battery fires! Packs from Amazon are fakes and rarely even have a bms. There is a girl on youtube forgot her name, but she was given several Makida batteries and found one that was in the process of thermal runaway and threw it outside where it eventual bursted into flames!
Thank you for your well intended warnings. Lithium based batteries are potentially very dangerous, especially when over-heated, over-charged, over-discharged. or physically damaged. They certainly scare me.
I cannot answer for whether any of my batteries have a "real" BMS. And there have also been name-brand batteries that have been recalled.
Hey mate, couple things to note.
When you replace individual cells you want to match the capacity to the old cells. Ideally you would want to replace every cell so they are closely matched, voltages of every cell need the be matched in the pack as well. Having 2 cells higher capacity then the rest will cause balance issues within just a couple charge cycles and may kill the rest of the pack in a short periods of time. I did notice your cells are already badley balanced when you assembled the pack so unfortunately there's already a issue.
As for spot welding, the nickel strip on the battery has a slit in it, you ideally want to have this slit inbetween your probes as it allowes the current to flow through the battery cap and not just across the top of the nickel.
I do apologise for stamping down your success but unfortunately your method is unsafe but I do understand that we go into things sometimes with not enough knowledge and don't know it!
One other note, your charger, get a proper charger, you should not have been seeing more then 4.2V when you checked it with your Multimeter, very concerning. If you want any suggestions on brands etc feel free to ask!
Otherwise great video :)
Thank you for your polite and sensible criticism.
I was fairly aware of the balance concerns on the batteries. I have a similar concern on my Ryobi mower batteries.
Slitting the strips makes a lot of sense. I should have figured that out when seeing the slits in the existing "strips".
OK I'll bite what brands do you prefer? Please and Thank you