I mean 1v for the battery voltage vs the spare one with 160v after 5years.
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Total battery voltage = 1V? Measured how?

 

With multimeter open battery pack

 

Where did you measure?

 

From the terminals like you explained in your thread
https://electricvehicleforums.com/fo...ry-jump-31056/

 

I can't imagine a scenario where an intact battery could possibly measure 1V. 250 cells in series will have more than 1/250V EA. My gut says there was a broken connection, safety plug not in, relay or something not secured to the terminals, etc.

Did you attempt to measure the voltage across a stick by piercing the shrink wrap?

 

Yes Sir with the orange fuse plugged. I measured by disconnecting the connectors from the jump starter to use the pins. And with the new battery I made the connections there without disassembling the rest.

 

Again, did you attempt to measure the voltage across a stick by piercing the shrink wrap?

 

No, maybe I don't understand what you want to say. Can I have a picture of that part please? I just checked the voltage from the terminals underneath and from the connectors at the output of jump starter

 

You don't get battery voltage at the jump start output with the safety plug out.

When the cover is off, you can see the top layer of sticks. You simply press the voltmeter probes into the green shrink wrap hard enough to pierce it. Sometimes you need a scratching motion to get through the shrink. That will give you a reading of 4 cells. You can also check the top left cell and the bottom right cell on that layer to check the voltage of 129 cells: