Must LITHIUM BATTERIES be BALANCE CHARGED ? #15

Some years ago I installed an extra 4 kWh battery pack in my 2008 Toyota Prius, it consisted of two packs 24V of 6 LiFePO battery banks in series. The 48V was then converted into 200V and set parallel to the existing battery. After a couple of months the capacity dropped rapidly and the BMP kept moving charge from one cell to another. I decided to take the BMS completely out of the system and within two weeks the cells fully recovered and I got the full capacity back. The problem with a BMS is that it looks at voltage only, not charge. Nice explanation, thanks for the video!

Clicked play, was interested, and a couple seconds later it had been 13 minutes. Good video

Been in electronics a looong time Best explanation I have heard. We are never too clever, or too old to learn.

Great explanation. Most people that complain and criticize never actually do what they are criticizing about. On the other hand, you are speaking from experience! Keep up the great videos!

Yay! Less cost of charging and alot less thinking involved in this aspect now. Very clear, thank you

Jehu, I love your style my friend and appreciate all that you do and teach. Great thing, please keep it up!

Goddamn crystal clear explanation, better than my university professor !!!

Haha I love how the video end with your high hopes for the drone to help storytelling and it crashes at first launch. I almost picked myself. Keep up the good work sir you are not only brilliant but entertaining at the same time

Entertained and highly informed. I enjoy your relaxed, friendly and authoritative style. Makes me feel comfortable heeding what you say and confident to act upon your advice... Thank you.

This video is awesome. Thank you for the time and knowledge you put in to this!

EXCELLENT presentation, keep these good vids coming, very informative!

Nicely explained and clearly stated. When most of us recycle all kinds of 18650 cells from old laptop batteries I'd bet most of us worry about charging and discharging them out of recommended voltage ranges. I just use two B6 chargers to manage the individual parallel banks so they are balanced. Since the cells vary wildly I never get them perfectly balanced but as you said, when they discharge at a rate of 2 amps each it doesn't matter.

This is so cool. Great explanation using interesting but relevant side notes and visual

great video man, there was an article in march version of home power magazine that covered this very nicely, they took 48 cells all manufactured from the same place and on the same day, they then split them into 2 groups, they made packs of 4 cells. on 6 of the packs they installed a very commonly used universal battery balancer on them. then they left the other 6 un-balanced as a pack, then they ran them under loads using the same load over and over to simulate usage on the cells to use up the cycle life of the cells tell the capacity of the cells starts to drop. in the testing they found out that the cells that were hooked up to a battery balancer during its charge cycle reached its 1/2 cell capacity limit 37% faster than the cells left unbalanced, the theory behind this is that when the balancer is balancing the cells its applying a micro load the cell that needs balanced in the pack and when it does this the pack voltage drops and the charger sees this drop in voltage and starts charging the pack over and over tell the cell is considered balanced, these micro loads and charge cycles during the balancing phase takes micro portions off the cell cycle life over time, resulting in that cell wearing out quicker... the only benefit of balancing the pack is to get slightly longer pack life out of a single charge when in use... the more cells you have in a pack that spreads the amp draw reduces your need for balancing, because the cells will stay closer in voltage as the cell capacity increases on the same load over time..

Great demo. Really shows the difference what a high load can do to a battery.

Excellent video, that's why you're "THE BOSS"

Great video as always Jesus, thanks for sharing your knowledge and experience

This video is so incredibly smooth. Damn.

No shenanigans just excellent information. I like your style, you are very smart. Awesome electric bus you got there too. Thanks

This is probably the most informational video I have seen yet on conceptualizing a battery pack for my electric vehicle. Thank you for clarifying many things. My vehicle is powered by two 500 watt, 48V hub motors. The current battery pack consists of 4 Sealed Lead Acid 12 volt batteries. Very heavy and doesn't deliver the range I need. My desire is to build a Life Po battery pack of 14s7p to provide me with 550-720 watt/hours of use. with 98 cells, I was confused about balancing vs. monitoring. Your explanation of power drain was very helpful. Since there is doubt in my mind about many of the Balancers ability to actually balance cells, I think I will stick with not having a BMS. It make further sense as I will not be requiring more than 20 amps of power at any time (most likely 10 amps steady), so the drain should be low compared to the capacity (below 2C if I am correct). Thanks again.