I tend to agree with Imeo that it could be the battery's PCB. Over tightening a GGTS (which is easy to do) can crush a PCB and cause it to trip prematurely when underload, like each time you hook up an atty. Or, it also could be that the cells are just worn out. If you routinely run cells down until the protection circuit trips, this will cause cells to wear out fast. Worn out cells will show voltage but fail when put underload. Try a new battery (other than the two you have) and only tighten until there is no rattling of the battery when shaken. Then put in a new atty and test.
Edit: Just in case there is a short tripping the PCB like Harley mentions, use a LiFePO4 or LiMN battery, one of the safe chemistries that do not have PCB's. If there is a short, the button, battery and PV will get hot very fast, so be prepared to remove the atty and or batt quickly.
Edit: Just in case there is a short tripping the PCB like Harley mentions, use a LiFePO4 or LiMN battery, one of the safe chemistries that do not have PCB's. If there is a short, the button, battery and PV will get hot very fast, so be prepared to remove the atty and or batt quickly.
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