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OK, I ran another auto E with the B&D. Took maybe 3 hours or so, which told me it maybe doing some good.
Let them rest for a day and took a reading from one cell.
1.285 at 50F. Which is roughly the equivalent of 1.280 at 60F.
So that would indicate a gain of about 0.005
Then I ran a couple more and got 1.300 this morning at 33F. That would be roughly a 1.290 equivalent at 60F and a 1.280 at the 80F standard.
So it seems I'm making progress.
The Beast would probably get this done quicker. But at a slight risk of eating some of the plates. With the BD... I can just keep running auto Es until there is no increase.
But MAN was MEX right! (surprise)
The date code on these is the same month I bought them. 2/22. What percentage of average GC2 buyer is going to even KNOW they need to do this kind of procedure before installing their brand stinkin' new batteries... let alone have the equipment to make it happen. I'm betting it's less than 1%.
Makes me wonder...
In my research of LiFePo4 info, I came across a youtube video with some extensive testing between the LFPs, AGMs and 4 Costco / Interstate GC2s. He noted the lead/acid batteries did not perform to spec... even under mild conditions like an 8A draw per 4 GC2s at room temperature. Stopping at 12.0v, they came in at 197A (47%.) At first that had me concerned. But I'll bet you anything the guy didn't fully top them after purchase.
I mean, I've made about a 0.015 gain so far. That's fairly significant.
But the GC2s fared much worse discharging at 80A. And much worse in the cold.
So I'm leaning toward not putting good money after bad. Maybe start by leaving the G27s in the tray and adding some LFPs under the bed to build capacity. But that's for another thread.
Let them rest for a day and took a reading from one cell.
1.285 at 50F. Which is roughly the equivalent of 1.280 at 60F.
So that would indicate a gain of about 0.005
Then I ran a couple more and got 1.300 this morning at 33F. That would be roughly a 1.290 equivalent at 60F and a 1.280 at the 80F standard.
So it seems I'm making progress.
The Beast would probably get this done quicker. But at a slight risk of eating some of the plates. With the BD... I can just keep running auto Es until there is no increase.
But MAN was MEX right! (surprise)
The date code on these is the same month I bought them. 2/22. What percentage of average GC2 buyer is going to even KNOW they need to do this kind of procedure before installing their brand stinkin' new batteries... let alone have the equipment to make it happen. I'm betting it's less than 1%.
Makes me wonder...
In my research of LiFePo4 info, I came across a youtube video with some extensive testing between the LFPs, AGMs and 4 Costco / Interstate GC2s. He noted the lead/acid batteries did not perform to spec... even under mild conditions like an 8A draw per 4 GC2s at room temperature. Stopping at 12.0v, they came in at 197A (47%.) At first that had me concerned. But I'll bet you anything the guy didn't fully top them after purchase.
I mean, I've made about a 0.015 gain so far. That's fairly significant.
But the GC2s fared much worse discharging at 80A. And much worse in the cold.
So I'm leaning toward not putting good money after bad. Maybe start by leaving the G27s in the tray and adding some LFPs under the bed to build capacity. But that's for another thread.
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