dnmun said:
i am afraid some of those cells are already dead. those voltages were recorded long after he took it off the charger so all those high cells were .4V-.6V higher when charging, so maybe they sat at 4.4-4.5V for a long time.
this is what makes me mad about the dumbasses that tell newbies they can build a battery without a BMS and use it without a problem. now this guy has lost very valuable A123 cells because he believed the misinformation he was fed by the self styled experts.
if he had put a $75 ping signalab on there, it would never have drained to zero and never overcharged, and he still has to buy one now to get the pack to balance and it will be even harder with these bad cells in there with the screwed over internal resistance preventing them from balancing together with the others.
you guys who talked him into this should recognize what you did and send him some money to recover from your misinformation. you know who you are!
This is interesting yet your telling the "Tofuuu" to keep charging a 16s from 37v with out knowing if there are dead cells or a possible failure of his
BMS. Is it possible for the bms to be bringing up 10s or 11s of the 16S to 3.7v per cell/parallel string and showing him a 37v pack voltage?
I have learned to charge without a BMS. It is a skill. A good BMS would make charging easier (agreed). I prefer to go BMS less because I know
when I charge my pack, each "S" parallel bank is fully charged. Going BMS less is not for people who lack the knowledge. There will be people
who can learn to accomplish this task, and others who may fail. One would expect that a person who builds their own pack would learn about
charging procedures/discharging procedures as these batteries are not inexpensive.
At this point, I'm interested in a BMS and building one, as I now understand what a BMS duties and responsibilities are.......I can watch the BMS
to ensure it is functioning properly
Also, I would hope that you would not be referring to me with the words "misinformation". Any information that I've give is from:
Experimenting - Observation and Taking notes
If one reads many threads here, I'm sure they'd understand the risks involved during the learning process.
After all......didn't all of us start this way? Combination of learning, takings risks, experimenting, observing and taking note of outcomes.
Sounds like a regular day in a life
Tommy L sends....\\m//
I'm neither for or against BMS. I like to learn how everything works 8)