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Old Aug 11, 2015, 02:01 PM
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Quote:
Originally Posted by franjo148 View Post
When charging 2 batteries in parallel PowerLab 6 shows info just for one battery? Same in PowerLab 6 PC SOFTWARE?

Where can I see info (or graph) for second battery?
You can't. The very nature of parallel operations precludes seeing the individual batteries. What you see is a single battery that has the properties of the two (or more) batteries combined. This is true for every charger no matter the manufacturer.

If you must see each of the batteries then you must do a single battery.

Glen
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Old Aug 11, 2015, 03:23 PM
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duplicate....
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Old Oct 06, 2015, 11:22 AM
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A new 4s5000 pack from our favorite overseas cheap battery source.

First time putting it on the PL6 it triggers into a Safety charge. I check cells, one cell is 0.3 volts lower than the other 3.

Can the PL6 save it, or do I consider it a waste, discharge it down to zero with my car tail light assembly and throw it away?

Bought in July, discovered the issue in mid-September, so even a strong customer service org would be unlikely to help.
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Old Oct 06, 2015, 11:29 AM
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If one cell is that low, because its faulty, or just because something discharged it, its toast anyway. Bin it after your tail light affair.

But beware that the tail light will put the dead cell into reverse charge, which may make it ignite! Better to use a charger to discharge it with balance enabled, to a low level, (if it will do so without the usual "error" issues). Or take it outside and bang a nail through it safely and watch the fireworks! Then throw it away.
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Old Oct 06, 2015, 02:17 PM
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I wouldn't automatically toss a pack because one cell is 0.3 lower than the others. Charge it and run some cycles and see how it does.
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Old Oct 07, 2015, 11:20 PM
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Quote:
Originally Posted by BrownEyedFool View Post
First time putting it on the PL6 it triggers into a Safety charge. I check cells, one cell is 0.3 volts lower than the other 3.
The main concern with packs that show a single low cell is an internal short. If there is an internal short, the low cell will just getting lower. If that is the case, the pack should be discharged and discarded.

In some cases packs arrive out of balance due to faults in the assembly process. If the low cell does not have an internal short, the pack can be recovered by bringing up the low cell and balancing the pack.
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Old Oct 08, 2015, 09:11 AM
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I must add that I miss-read that post!
I thought one cell was at 0.3V...

Either way its a good sign of a bad cell. It wouldn't have left the factory that way so it has some internal self discharge fault going on. So I may well charge it in a safe sack, but would watch carefully. Houses and cars cost more than a battery pack. And it may do it while you are out of the house at some random point. I keep my stored lipo packs in the fridge normally at 60% in a safe sack.
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Old Oct 08, 2015, 03:45 PM
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Quote:
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It wouldn't have left the factory that way
I wish that were always a safe assumption, but its not. There have been many reports like this of users receiving brand new packs that the vendor claimed were checked during packing for shipment to the customer. The packs arrive with one low cell which is later confirmed to be not caused by self-discharge. If you report these to the vendor within their required timeframe, they may address it. Others have just cycled the packs and found that cell appeared to recover and showed no signs of self-discharge.

It points to several issues in the manufacturing and supply chain. It may be caused by a bad cell, but not always. One is wise to select quality packs, and quality vendors to avoid such issues. And of course, I would not fault anyone for not wanting to take a chance on a pack in this condition.
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Old Oct 08, 2015, 05:02 PM
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Yeah my inquiry with HK pointed out their 30 day warranty period, which is long expired.

I may see if the PL6 can bring it back up this weekend, but don't think I'll trust it anyway, it's already been marked with a ? with a sharpie (which is my scarlet letter for Questionable ie don't trust it on anything I care about).

So it wasn't high end to begin with and I'm SOL now anyway. Likely hook it to a tail light bulb in a metal pan and let it discharge.
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Old Oct 10, 2015, 05:18 PM
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At my bench building a wing so I said what the hell and out that lipo on for a 1C charge. It immediately kicked into safety charge and has been valiantly trying to balance it for an hour and twenty minutes. Three of the cells are in the 3.81-3.82 range while cell 4 is at 3.76. Internal resistance range is 2.5 to 4.8, with the questionable cell at 4.4.

Didn't write it down but I think starting voltages were 3.75 range for three and lowest was cell 4 at 3.55.

Fiddle with it and keep trying or discharge and discard?

Wouldn't even bother but I'm sitting next to it building
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Old Oct 11, 2015, 12:43 AM
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Quote:
Originally Posted by BrownEyedFool View Post
At my bench building a wing so I said what the hell and out that lipo on for a 1C charge. It immediately kicked into safety charge and has been valiantly trying to balance it for an hour and twenty minutes. Three of the cells are in the 3.81-3.82 range while cell 4 is at 3.76. Internal resistance range is 2.5 to 4.8, with the questionable cell at 4.4.

Didn't write it down but I think starting voltages were 3.75 range for three and lowest was cell 4 at 3.55.

Fiddle with it and keep trying or discharge and discard?

Wouldn't even bother but I'm sitting next to it building
Its your call. But can tell you this. You are now below the 150mv delta that will trigger safety charge. I'd stop the charge cycle and restart it and will likely charge normally. I would charge at least at 1amp and not above 1c for the first charge.
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