As is "10,000 milliamps per hour".
You likely have a 10 amp hour, 3.7 volt battery yielding a capacity of 37 watt hours. This is about the same capacity as an ordinary smart-phone (perhaps a bit larger, I think an iphone is 5 or 10ish ).
I'm just trying to address the confusion here. Battery capacity is a relatively mundane detail, and I don't necessarily expect the people writing marketing copy to understand electrical terminology.
The capacity for energy storage is volts * amps over time. So a 10 amp hour battery at 3.7v holds less energy than a 10 amp hour battery at 12v. Together it makes watt-hours. That's the best way to measure storage capacity.