motomech wrote:The Blue ones were accurate enough, but the blacks ones(which seem to be all that is avail. these days)are junk.
Of the 4 black ones I have, only one matches my blue ones in values
Still, Battery Medics are about averages, not super accuracy.
If one or more BM's are being used and are close to each other(.002 to .003V), they can still be used to balance.
I wonder if we are being too picky about getting the cells exactly the same and I suspect that differences or .003V or .004V are not that critical.
But then again, I have found that if the cell values of two bricks are <.005V in difference, and the main power cables are paralleled, I can get an in-rush spark.
Yeah they will still be great for fast 'ball park' checking of my cells, glad I am not reliant on them for balancing though, mine only measure to the nearest .01v do yours go to .001v?
Only once I fully charged did I get one of the BM'ss out by the .04v
When I measured with volt meter all the 3 4s 16Ah bricks were well balanced upon arrival, within .01v, one brick took ages for the first balance though, 2nd cell took a lot to come up to fully charged voltage, so will keep a close look, may be an over capacity cell or something worse, but sorted my back rack so I can easily check/balance & even remove the pack easily, so no more excuses re: not balancing often.
EDIT: I don't suppose anyone knows about the Turnigy Deluxe ones? http://www.hobbyking.com/hobbyking/stor ... S_6S_.html
mine only measure to the nearest .01v do yours go to .001v?
Oops, my bad, I meant hundreds of an inch, not thousands(POST EDITED).
FYI. With one of the blues ones I have, the discharge/balance values can be set every .01V. For example, 3.80V, 3.81V, 3.82V, etc. It's great! The other two blues ones can be set every .05V, 3.8V, 3.85V, 3.90V, etc.
And of course the black ones which can only be set every .10V, 3.80V, 3.90V, 4.00V, etc.
And the black ones, on full discharge over-heat and turn the screen black. They will work ok in balance mode though.
Since I had three extra blk. ones, I tried a few "dirt floor" mod.s
First, I tried a "splitter" balance lead that would allow 2 BM's on one bank of cells. Although it would discharge twice as fast, it wouldn't balance, as the single cells would "bonce" back and forth between the two BM's.
Then I tried attaching a sm. 24V, 40mm X 40mm computer fan on the back of the BM and running it off the 6S brick's Voltage. It wouldn't run on 22.4 Volts. Then I tried a 12V mini-fan and it works, discharging faster without the screen going black. Needless to say, it really hums on 22.4 Volts and the little motor is on the brink of burning up(I can smell it). I did two that way and use them when I need a fast discharge.
Looks like the new Turnigy discharger/balancer are the ones to use.
I would like a more detailed report if someone feels like it.
Things like what increments of setting? Every .01V, .05V or .10V?