I only purchased my 2nd JS 80 about a month ago and just last week while we were travelling remotely in Far North Queensland, we had the misfortune of experiencing a cranking start battery failure. There was no way we could have notified anyone. We had no terrestrial phone or internet coverage, so we just dealt with the situation we found ourselves in and used the JS80 every time we needed to start the vehicle.
Recharging the JS 80 was by way of plugging in to our onboard inverter while the car was running. I'd get at least 4x JS80 starts before the starter health indicator LED lights reduced from 4 lights (full) to 3 light (3/4 full). So, then a recharge from the inverter was in order to keep me mobile. Even though I probably could have got another 10 jumpstarts out of it, I really was not in a position to test it to that extent.
My first JS80 did not have a protective case. My new JS80 was purchased with a ZipUp protective storage case. I love it.
Thanks iTechWorld. For my money, your JS80 is a lifesaver.