+1 to top charge that one cell alone to verify.
I would put them in service and see what goes if there is little chance of refund. Give it a few weeks before you spend more money.
Top balancing question
- Thread starter tsunami3775
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I would put them in service and see what goes if there is little chance of refund. Give it a few weeks before you spend more money.
tsunami3775
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Yah I charged that cell alone. Voltage still drops that fast
tsunami3775
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Does anyone know where I can buy 1 280ah lifepo4 battery in the US? Seems like I have to buy 4.
John Frum
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Battery or cell?
tsunami3775
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Cell
John Frum
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Expect to get the least awesome cell from their collection.
Struc
Collecting Parts!
@Amy Zheng do you sell individual 280ah cells?
Excellent info here...when you're in the middle of it a good explanation of what is going on really makes sense. Otherwise my eyes just glaze over.
I've been top-balancing my pack for three days and thought something was wrong.
I've been top-balancing my pack for three days and thought something was wrong.
sunshine_eggo
Happy Breffast!
Lots of folks who purchase commodity cells buy a spare or 3.
Expect to get the least awesome cell from their collection.
Definitely what my spare was. Total outlier.
When i was working with a large auto manufacturer, it was common for our suppliers of smaller value parts to deliberately put defective parts in.
A classic example is a screw manufacturer - every now and then you’d get a screw with no thread - just a head and straight shaft. Operators routinely threw them out and didn’t raise a defect notice. I found out later it was a screw factory run of 10000 screws that failed. They just kept them and chucked a handful in subsequent orders until they were gone.
Effectively got paid in full for defective parts.
The cynic in me thinks that if a supplier notices an order for an odd number of cells they will throw in a dud and hope for the best.
A classic example is a screw manufacturer - every now and then you’d get a screw with no thread - just a head and straight shaft. Operators routinely threw them out and didn’t raise a defect notice. I found out later it was a screw factory run of 10000 screws that failed. They just kept them and chucked a handful in subsequent orders until they were gone.
Effectively got paid in full for defective parts.
The cynic in me thinks that if a supplier notices an order for an odd number of cells they will throw in a dud and hope for the best.
