1. I'm in test of two 3s battery packs to replace a lead acid battery on my hot tub eco outhouse set up. But waiting on my bms boards to come in the post. So am I free to test without bms. I won't b testing with a high load. Couple of led lights, phone charge water pump and the testing equipment. All was fine with the lead acid battery with a bms which I have purchased now and as far as I can see my solar charger was doing the same job. O with a little help from a imax balance charger.

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2. Thank you for your very interesting comments on BMS. I have a battery pack for a small old Italian Car, the Y 1969 FIAT 500. It is a 96 V, 60 Ah, made of 21P-26S Samsung INR18650-29E Lythium-Ion cells. The first time we ran the car for 8 km (it was also the first time we tested the car with the new electric motor). The BMS stopped running due to the burn out of 6 of its 12 MOS FET. Since it was the first time we tested the car, we were thinking we made a mistake, so we changed the BMS card with a new one. With the second, new BMS card, we run the car for about 200 km and then we had the same problem. Now that I hear your comments, I think I will remove the BMS and run without it. It seems obvious that the reliability of the BMS is lower than the reliability of the battery pack!

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3. Jehu, I just bought 2 Fiat 500e Bosch battery pack made with Samsung SDI cells. I want to make a solar generator "portable" that I can hook up to solar panels and charge all day and use the generator at night to power a few things. I have been searching for a BMS for them but cannot find any for that setup. Should i just bypass getting a BMS and just monitor the batteries every so often? what are your thoughts

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4. Hi @jehugarcia do you still have this view on bms ?

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5. DIY powerwalls still need some form of protection against faulty cells even if it is just using fuse wire for connections. If you actually test each cell properly and match them a BMS isn't really needed but there are a lot of people just slapping packs together without carefully matching up capacities. I put together a small 4S 18650 pack using a 4 cell holder with with a BMS to try one out and quickly learned to appreciate short circuit protection as well as under voltage protection. If you get into high drain applications where your current is several C's you really need to monitor voltage levels of each cell/parallel group since you can easily end up with one majorly sagging below the rest.

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6. If you like battery dont use bms……. wtf man?!?!?!?!?

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7. I’m just starting out with building battery packs and saw your video. I’m a little confused, I consider you an expert in this field and wonder if I’m wasting time trying to research this management system. Thanks, Joe

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8. So Peter Mathews joined the "dark side" and is using a batrium BMS now. Your thoughts?

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9. It's pretty scary people are selling Tesla battery not using the charging BMS system that is On bored those exact batteries every one of those individual cells in a Tesla battery is individually controlled with a six channel Panasonic charging chip which is all CAN network together. two wires gives you access to every individual battery cell. I thought Tesla was open code that information should be out there ?

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10. It's pretty scary people are selling Tesla battery not using the charging BMS system that is On bored those exact batteries every one of those individual cells in a Tesla battery is individually controlled with a six channel Panasonic charging chip which is all CAN network together. two wires gives you access to every individual battery cell. I thought Tesla was open code that information should be out there ?

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11. i built my Lithium battery pack for my electric scooter Tao Tao ATe 501. based on the video Jahugarcia did for me about how many batteries would be needed to for 72 volt scooter with a 500 watt brushless motor. I did not use a BMS. My battery pack has been stable and runs great. if you build your pack properly with enough capacity and quality lithium batteries there should be no issue with overheating the pack, and unbalanced cells. if this is happening your not building your pack correctly. a bms is nothing more than a safety monitor to keep up to date with any possible unbalanced cells. normally my sla battery pack would be used up in about 3 moths of use, my lithium battery pack has been running since July 4th weekend and show no signs of performance loss. i want to thank Jahugarcia for creating these topics of discussion. i will be doing a video soon of how i construct my battery pack, and how i test the cells to see if the battery is unbalanced. every month or 2 i have been removing lithium pack and testing for unbalanced cells, so far all the cells are exactly the same voltage. and my capacity and driving time is much longer use. i saved myself tons of money by switching to lithium batteries. i can purchase the lithium batteries quality batteries for about $235.00 incl shipping qty 200 of quality batteries built in china by company called BAQ. I am now taking request from local electric scooter dealers to build them lithium battery packs. i can retail the packs for about 400 to 500 completed.. The same sla batteries qty 6 of them at 13lbs a piece is about 480 dollars. not only do have a better and lighter battery it cost me much less to replace it and i will not be replacing the lithium battery yet, because it still runs like its brand new. Just so you know I travel about 30 miles a day on full charge with my scooter. charge time is a little longer with lithium battery, but i charge my scooter overnight, so by morning my batteries are fully charged. i might purchase higher amp output charger to charge them quicker. but for now everything is working great.

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