E-bikes usually advertise an estimated range. For example, I have a retro-fit that claims a battery range of 30-70 miles. 70 miles would happen only under IDEAL conditions ... I'd need to be carrying minimal added weight, be riding fairly flat roads at the lowest assist level & maybe have a tailwind. My battery is only slightly smaller than Tiffany's. I usually get around 35 miles UNLOADED here in the mountains of NH.

Not sure that battery range had anything to do with this rider's incident, but looking at the map of its mountainous location and her load, she would certainly get the minimum range. Map shows where the pavement ends. Sounds like Tiffany may have traveleled further before the avalanche and then ditched the bike before backtracking to the cabin on Lake Edison?

Article said her bike had a range "up to 45 miles". But add 3600+ feet over Kaiser Pass? She'd be lucky to get much more than 25 miles before running out of gas unless she topped over her battery at Mono Hot Springs (still snowed in?) requiring a lengthy stop. No mention if she was carrying a spare or had the optional larger battery.