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Search: Posts Made By: JohnMuchow
Showing results 1 to 25 of 68
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Forum: Batteries & Chargers
12-27-2008, 01:27 AM
Replies: 7
Views: 879
Posted By JohnMuchow

RE: Explain Discharging and auto cycling to me

HeliStyle
I have some NiCd/NiMH info on my web site at http://www.camlight.com
Check out the Why Discharge? and Tech Tips sections.
Forum: Batteries & Chargers
12-23-2008, 10:19 PM
Replies: 0
Views: 385
Posted By JohnMuchow

CBA II Thermal Analysis - Does the CBA run too hot?

Hello all,
After hearing of several CBA II's burning out their MOSFETs, often along with other components, I decided to do a thermal analysis of the CBA. I've posted it at:...
Forum: Batteries & Chargers
12-08-2008, 04:14 PM
Replies: 11
Views: 1,186
Posted By JohnMuchow

RE: Graph 3300 -4200 NIMH

Hi guver,
I don't remember but are 1.0.8.1's Help files online? If so, it might be trying to connect to see if any updates are available.
Don't know why it would try to check for Help updates...
Forum: Batteries & Chargers
11-24-2008, 07:09 AM
Replies: 25
Views: 1,933
Posted By JohnMuchow

RE: Good Form/Cycle charger

I've had good luck with both the iCharger 106B+ and 1010B+ with my NiCd and NiMH packs.
Forum: Batteries & Chargers
11-21-2004, 11:12 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Thanks for posting that Red...I completely forgot about the rising internal res.
Forum: Batteries & Chargers
11-12-2004, 10:14 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

I'm not worried about the capacity at all. :-)
But, frankly, I would have expected a higher number from GP3300 cells at that low a current level. You're using a very high cutoff voltage and...
Forum: Batteries & Chargers
11-12-2004, 12:53 AM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Nothing magic, but they are different cells than yours. Don't know what that means though. :-)
I am very, very interested in testing your packs though. Do you have another method of measuring the...
Forum: Batteries & Chargers
11-10-2004, 11:09 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Don't limit the capacity! Do the full 330mA charge for 16 hours every time during conditioning, it won't hurt the pack. That excess charge helps balance the pack by allowing any cells that haven't...
Forum: Batteries & Chargers
11-09-2004, 10:31 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Check out the Astroflight Super Whattmeter and the Medusa Research Power Analyzers. Both measure AH going into and out of a pack in addition to the current and voltage levels of the pack. The...
Forum: Batteries & Chargers
11-08-2004, 11:24 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Yes it does. The ampere-hour meter (or coulomb-counters as they're sometimes called) continuously adjusts to give you a real-time measurement of the AH going into or out of a cell/pack.

Most of...
Forum: Batteries & Chargers
11-08-2004, 11:06 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

I'm looking forward to the results of these tests!
BTW, if you'd like, send me one of your ProMatch packs and I'll put it through some testing here and let you know what we find.
Forum: Batteries & Chargers
11-08-2004, 10:07 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

For those recent tests I used an Astroflight Super Whattmeter to track the AH coming out of the cells.



All of our dischargers are constant-resistance dischargers. That is (as you...
Forum: Batteries & Chargers
11-07-2004, 10:33 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

I'm getting about 3.05AH from the pack before the 5.4V cutoff (0.9V/cell) at the .3C discharge rate, 2.8AH at the 3C rate and about 2.5AH at the 7C-8C rate.

3 cells dumping is better, in a way,...
Forum: Batteries & Chargers
11-07-2004, 08:37 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

These packs are from Steve Hill at battlepack.com and were originally from two of his standard 20-cell Sanyo N3000-CR BattlePacks that I broke up into several smaller packs to use for various tests. ...
Forum: Batteries & Chargers
11-07-2004, 01:08 AM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Mike, I finally had a chance to do the tests. These are with the same 2 packs in series; 2-cell and 4-cell Sanyo N-3000CR with very different usage. Prior to the tests below, these packs were...
Forum: Batteries & Chargers
10-31-2004, 02:39 AM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Mike, I did it at 0.3C because your earlier post said that discharging at lower rates was more likely to cause problems. I wanted to try to replicate your test setup.

I real-time monitor the...
Forum: Batteries & Chargers
10-30-2004, 03:35 PM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: RX voltage display

Thanks for you nice words Bill!
I think you nailed it with the above statement. One of the hardest things for us to decide is how much information to present when talking about cell care and...
Forum: Batteries & Chargers
10-30-2004, 01:23 PM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

While this can be true for a pack with unbalanced cells, it doesn't have to be the rule for all packs. :D
Keeping the cells balanced as much as possible (by conditioning new cells, occasional slow...
Forum: Batteries & Chargers
10-30-2004, 03:19 AM
Replies: 54
Views: 4,634
Posted By JohnMuchow

RE: Discharging to .9v/cell

Any load that doesn't harm the pack is acceptable really. It all depends on how fast you want the discharge to go, the impedance of the cells, etc. But, the faster you go the less efficient the...
Forum: Batteries & Chargers
10-30-2004, 03:06 AM
Replies: 2
Views: 661
Posted By JohnMuchow

RE: Quick Charging NiMh

I agree, 1C max. current (1800mA) for charging.
About 0.5C (900mA) is a good compromise between fast charging and not overheating the pack.
Forum: Batteries & Chargers
10-30-2004, 01:35 AM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: Impedance

Bill, I think there are some great ways to distill some of this information down into practical recommendations good for everyone. We have already indentified two new sections to add to the Tech...
Forum: Batteries & Chargers
10-29-2004, 03:21 PM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: Impedance

Another bit of info from Eveready's NiMH guide (with an interesting difference between NiCd and NiMH cells pointed out):

For purposes of electrical analysis of the battery cell, the Thevenin...
Forum: Batteries & Chargers
10-29-2004, 03:15 PM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: Impedance

Here'a a data point to throw into the mix...

Eveready's method of calculating DC internal resistance of NiCd cells (copied from their on-line guide):
Internal resistance (Re) is calculated...
Forum: Batteries & Chargers
10-29-2004, 01:18 PM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: Impedance

This is where I'm still a bit confused as to how to apply the impedance numbers. The typical R/C load is pulsating DC, a varying duty-cycle waveform from 0 to full current draw for the motors (same...
Forum: Batteries & Chargers
10-28-2004, 10:17 PM
Replies: 119
Views: 10,631
Posted By JohnMuchow

RE: Impedance

Internal resistance is often measured with a 1KHz AC discharge current waveform so "impedance" works. There are DC-current internal resistance tests but, I believe, the AC numbers look better as...
Showing results 1 to 25 of 68
 
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