My apologies for the delay on the batteries. Unfortunately, pretty much everything is backed-up in the bicycle industry right now due to the pandemic. I believe this is the case for many other industries as well. I'm not sure on the specifics of which exact part(s) of the supply chain is delaying Bosch's batteries, but it's affecting many other things as well. I keeping hearing about delays with other bicycle components... lead-times ranging from 6 months to nearly 2 years on brakes, forks, etc., etc. An electronics manufacturing company I am close with has completely discontinued a few products because one of the critical components currently has a 3 year lead-time. Global supply chains appear to have been greatly affected by temporary shut-downs, reduced personnel availability, increased demand, reallocation of resources, etc.
If your Trek dealer has not already done this, they can set an "item-watch" for the Powertube 625 VERTICAL on QBP. This will alert them as soon as it is in-stock, and they can place the order.