Quote:
Originally Posted by IneritedInsight
Ron, I still haven't had any info on my battery
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It is shipping tomorrow. It was assembled this morning and has been charging (waiting on line to charge because one charger is down for repairs).
*CORRECTION*
BB, I thought I was replying to kccode1.
HIS battery is shipping tomorrow. Yours isn't done yet.
Quote:
Originally Posted by IneritedInsight
Here's a question: If I understand this correctly, letting the battery sit without frequent use is one of the major causes of battery failure.
Wouldn't ALL the cells in the battery I sent in for repair be completely unusable now, due to lack of use? If they are all charged up and shipped back to me now, it seems like I'd be able to drive the car for only a few days before they'd all fail again since they've been discharged for so long. Am I understanding this correctly?
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No. Using the battery after it has sat is a cause for failure if the battery is not rebalanced before use. It is the discharging of the unbalanced pack that causes damage. Actual sitting doesn't hurt the cells in the slightest. It is the unified discharge of the mixed level cells that damages them. Your battery will be totally balanced when you receive it, so there is no problem.
Also, you seem to be under the impression that all the batteries are just sitting in the shop. That is not true. During any given day 10-16 battery packs are discharge tested and roughly the same number are charged up. Many times that many sit on shelves for a specific number of days so that we can test their leakage rates. About a dozen donor packs a week are dismantled and have some sticks put into stock for repair packs and the rest of the sticks stripped of their PTC strips and put into storage to be tested at a cell level later. Nothing is just "sitting there".
After a repair pack is tested, the bad sticks are removed and the mismatched ones are put into stock. The "good sticks" (the largest group of sticks that are good and match each other) stay in that pack and the pack is either populated immediately with matching good sticks, or if there aren't enough in stock it is put to the side to wait for enough to come out of donor packs.
In November, we revamped our testing procedures because some sticks weren't matching their test results. After developing corrected tests and thoroughly vetting the new tests (including testing in cars), we scrapped all October/November results and retested everything. This is the third time we have had to do this since 2008 and each time it has been because new types of cell failures have started to emerge.
The people here on Insightcentral who test their batteries are checking for one parameter. We perform that test on two different packs in the space of two hours. We currently run eight separate, different discharge tests for each and every pack. It takes a long time, and it seems like every time we figure out a way to speed things up, along comes a new test that has to be added.