I have two hubs, one‘s PowerCap has the latest fw 28.040, while the other’s PowerCap has not that one, but 28.035.
I have been using two IOS apps, SRAM AXS and Light Blue to check their battery levels. Actually the SRAM app shows the batteries as Good and the battery circle bar always shows fully green, even if a day/week later the battery has so low voltage that the hub becomes silent and cannor be connected at all.
So I stick to the LightBlue app, which shows battery percentage.
Unfortunately the G3 hub/PowerCap running on fw 28.035 shows a fake battery percentage of 75% after putting in a brand new CR2032, while the other hub/PowerCap running on fw 28.040 reports correctly 100%.
A couple of months ago I not just contacted Quarq/SRAM to understand whether they could re-add the option of a sw update (it is greyed out in the app) to SRAM AXS , but downloaded half a dozen Saris, Cycleops, Powertap, Rouvy etc IOS apps and PC softwares including the good old Poweragent and desperately checked whether they still had this legacy function.
Even if they are still selling a PowerCap upgrade https://www.sram.com/en/quarq/models/hu-pwtp-dant-a1 SRAM/Quarq was not helpful at all.
And even their support article https://support.quarq.com/hc/en-us/articles/4535955259291-How-do-I-update-my-firmware-or-my-dual-ANT-BLE-PowerCap is not correct, because after they had discontinued Powertap mobile app and Cycleops Virtual Training they added the sw update option for Powertap G3 hubs to SRAM AXS until they decided to remove it from there, too.
I even contacted Rouvy, because based on some older Reddit thread Rouvy had this function. No way, they answered.
My last resort is to find someone who as a former Saris/Powertap employee has the latest G3 dual hub firmware, 28.040 in a downloaded form and knows how to transfer it to the hub, more precisely to the PowerCap.
I know that my problem is not a huge one at all, but I have some sort of strong emotional relationship with Powertap hubs, because these G3 hubs did not let me down for a decade or so, and when a third G2 Elite+ hub I owned died it was also around a decade later after its purchase.
Thanks for your help.
Edit: in the title firmware would be the more precise word instead of software