Here is a question for the power block experts here...

I am very happy with my new Anker Solix F1200 power block.... EXCEPT... it seems to be running at half capacity.

It says it provides 1229 watt hours of power. However, even its own display indicates I get half that. For example, if I am running 30w worth of devices, it will tell me I have a little over 20 hours of power (and this seems to be accurate). It should be 40.

Has anyone seen anything like this, or do I just have a defective unit? I put in a question to the manufacturer about it. This half capacity forced me to spend more time in Starbucks recharging it than I cared to do.