Anyone know what's going on with Bosch Powerpack manufacturing? Don't see any 400 or 500s available. Are they made in China? Or Korea? Shortage is COVID related? Expected availability? (I know trying to get some telescope related stuff made in China right now is impossible.) My 3+ year old 400 is not holding enough charge to go 20 miles. Looks like it's time for a replacement. Want to get another 500 to go with my spare 500. Need both for 50+ mile rides on my Trek XM700. Saw one sold by Erik's in California a month or two ago but didn't purchase it. Had other priorities at the time.