Super Brain 989 stick cycling readings baffling me
Just started cycling sticks this weekend with a SB 989 with some questionable readings? My setup has an external fan keeping everything nice and cool. Cover off SB to expose heat sink, no problems with heat. I have set up for 7Amp on charge and discharge, 6500Mah, 6 cell, NImh,.9v cuttoff, 5deltaV, 130F cutoff, 20minute rest, 350Mah trickle, 5 cycles.
I have completed my first two sticks through 5 cycles, so I wanted to log my Mah and volt on my spreadsheet of each cycle of each stick. I find it odd the SB is showing the Exact same Mah of 7310 charge and discharge memory on all cycles of both sticks after initial 1st discharge of a varied lower Mah rating.
At end of cycles my first stick ended showing 7428Mah charge and 8.34V. My second stick showed exactly the same 7428Mah with an 8.44V. When I cycle through memory it shows the 7310Mah again for all charge and discharge cycles displaying c1,d2,c2, etc.
I didn't think it possible to have numbers repeat the same over cycles, especially two different sticks, perhaps I am not reading the memory settings correctly?
I have completed my first two sticks through 5 cycles, so I wanted to log my Mah and volt on my spreadsheet of each cycle of each stick. I find it odd the SB is showing the Exact same Mah of 7310 charge and discharge memory on all cycles of both sticks after initial 1st discharge of a varied lower Mah rating.
I have seen the same memory charge reading on on most of my good sticks. Apparently it is some screwey max variable in the SB software. This really isn't a serious problem if you think about it. It is the discharge data which is important.
Same here. I don't pay much attention to the 7310. Like Jime says, the discharge is what is important. As a side note, most people seem to use a delta of 6. Also, I haven't seen much difference after three cycles.
Like mentioned, 7310mAh is the most the SB989 will put into a "6500mAh" pack.
I've been watching how the commercial chargers handle charging/discharging a stick at the cell level.. It's not exactly ideal. I'm almost certain people are cooking cells in the very imbalanced sticks, Like this:
Cell #1 cooked in comparison to the rest of the cells. Look at that dV(51mV)! Even cells #2 and #4 were overcharged(13mV and 11mV, respectively) by the time the dV was triggered (set at 6mV), due to the other cells still rising. Granted this was at a 16A charge rate, more than the SB989 can do. But the problem still would have been present at any amperage. Imagine 50A....
There really isn't much you can do about it though.. just charge at as low a rate as you can stand for the first couple cycles. Just goes to show you that yet again, cell level is really the only way to go.
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Thanks for the replies guys, stick 3 finished same results. I figured it had to be the charger and not the batteries. Just started stick 4 at 4 cycles. Perhaps I will end up only 3 cycles needed.
So we should get to the bottom of his anomalous readings. Hmm.
Didn't we -- 7310 is 'just' some superbrain cutoff? And it seems to be associated with sticks that are in good condition, too: Data I have for two cycled packs (Eli's and Steve's from some time ago) show 7310 for most sticks (though only on the first charge), these two packs turned out to be good. Maybe that's not a deep enough answer, though... It does seem anomalous that the readings were 7310 across the board - for all cycles plus charge and discharge...
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Super Brain 989 stick cycling readings baffling me
