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As Battery University explains, "The worst condition is keeping a fully charged battery at elevated temperatures, which is the case with running laptop batteries." So I hit up (third-party sites), found a 12-cell battery for my ThinkPad, and keep it in the bag, charged at about 80%." ( Kevin ) That's it for our little experiment in (hopefully) helpful show and tell

The Hydro Flask kept things chilly for 72 hours and had a bit of solid ice left up to the end of hour 48

And better does not always have to mean more expensive

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