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Old Jul 01, 2005, 10:05 PM
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Fly boy look up the difference between a balancer and a charger. I do not think any balancer in the world will charge a battery. I keep reading the word "charge" in the quote you pulled up never once saw the word "balance"

Brian
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Old Jul 01, 2005, 11:23 PM
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Providence, RI, USA
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Quote:
Originally Posted by RD Blakeslee
Right on, John.

A prototype, using Multiplex six-pole plugs, has been built:

http://www.rcgroups.com/forums/showthread.php?t=236246

That thread is also referenced in post #6.

- RD
Yes, I had seen this thread awhile back and hoped that this would prompt a Lipo manufacturer to build packs like this.... still waiting...

John
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Old Jul 02, 2005, 07:10 AM
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A tip: If you've got a pack charged and you're not going to fly it right away, leave the parallel charging connector (Figure 3.) on it. That keeps all the cells at equal voltage for connection in series before flying.

But leave the cells disconnected from time to time, to check for cell(s) which have microshorts that are getting too large to be safe. Such cells will be at significantly lower voltage after a day or two. In other words, they will self-discharge faster.

- RD
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Last edited by RD Blakeslee; Jul 04, 2005 at 06:48 AM. Reason: clarity
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Old Jul 04, 2005, 06:45 AM
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In the series-charged pack balancer threads, various interpretations of what the balancer's LEDs are doing are discussed to find a weak cell in a pack.

With XS series-discharged packs, the voltage of individual cells can be measured AFTER DISCHARGE. A bad cell will be significantly lower in voltage.

- RD
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Old Jul 04, 2005, 07:33 AM
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Each cells voltage can also be measured in a series wire battery by way of the taps/connector. I find it much simplier to just plug in the TP-205 and let it do all of the work. I only have to make one connection and it takes a grand total of 5 seconds to determine the battery's overall condition as to imbalance or adnormal low voltage cells.


Charles
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Old Jul 06, 2005, 01:19 AM
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RD,
Maybe someone is listening to you! Here is a new $60 parallel charger: http://www.amondotech.com/index.asp?...ROD&ProdID=849. I've listed a subset of the product description.
Howard
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Old Jul 06, 2005, 01:52 AM
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Sheesh, you guys are hard to keep up with! I spend most my time reading and not enough building!

RD - I really like your approach, mon. Your solution(s) look realistic and easy to understand. I am going to give it a try. Don't give up!

Tom
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Old Jul 06, 2005, 08:23 AM
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Yo, Howard -

Looks like the common ground problem has been solved and the cells can be permanently connected in series for discharging through the pack's ESC plug, while the pack's charging input plug can remain permanently attached to the pack.

Good news! Simple, therefore inexpensive. Reverse polarization protection. Others will follow, I'm sure.

- RD
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Old Aug 27, 2005, 08:23 AM
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I've converted my cells to the single-cell form using 3.5mm bullet connectors from Electrifly, thought you all might like to see a picture - shows a single cell, I used male on the batt pos and female on the batt neg, my parallel adapter which will handle four cells, and a 3C pack that's set up for the nose of my zagi wing.
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Old Aug 27, 2005, 08:42 AM
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I have been thinking about charging packs in a similar manner to this. However, what I was going to do was to put taps on each cell and bring the taps to one connector. The cells stay connected in series at all times but are charged in parallel. This way you have just two sets of connectors from the pack, one to charge and one to supply power. I haven't done this yet but it should work. What are your thoughts on this?
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Old Aug 27, 2005, 11:30 AM
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you can't do that - I asked about it before, if you draw it out it's obvious. you're making complete circuits between the two sets of wires, connecting all pos and neg poles together. that's a bad thing. Do it externally to the pack, and all is well, as you only connect in series or parallel not both.
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Old Aug 28, 2005, 09:49 PM
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Hmmm, that theory didn't last long. You are right of course. Oh well, back to the drawing board.
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Old Dec 06, 2005, 06:50 AM
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The "Cheap, Easy Pack Balancing While Charging" system avoids the problems discussed here:

http://www.rcgroups.com/forums/showthread.php?t=449295

- RD
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Old Dec 06, 2005, 12:26 PM
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Here is another solution . Seperate parallel(?) charging of cells wired in series while only using one charger. Yes you still need taps and connectors but this will work with factory built packs.



http://www.amondotech.com/index.asp?...ROD&ProdID=849



Charles
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Old Sep 05, 2006, 01:01 PM
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K.I.S.S principle applied - TrueRC 4000 setup in a 2m fun-fly sailplane:

http://www.rcgroups.com/forums/showt...90#post6020878
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