What wears out or overheats that causes these failures? I'm sure it might not be this simple but wouldn't better heat sinking save the components that fry, or possibly a thermal fuse to prevent a meltdown? A stick around 8.4 volts pushing 10 amps is about 84 watts, add a little more for charging losses and it seems that this could be dissipated easily. ...considering that they support 10 amps and cells that could push voltage above 35 volts they need to have over 350 watts of power capacity so it doesn't seem that you are running them to their duty cycle. I'm not familiar with what is inside anything other than the most basic transformer power supply type of charger but I've dealt with plenty of other electronics that carry power loads to where this makes me scratch my chin a bit. Do these ever go back to the manufacturer to possibly improve the product? ...I suppose it could be planned obsolescence too since you use these far more than pretty much anyone else would.
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