Are all CR 2032 batteries then same?

The readout on my Powertap is really faint. I changed the battery, but it made no difference. Do voltages vary between brands?

no

Did you manage to sort the problem with your Powertap? I have had a similar problem with my Powertap computer but have yet to be able to sort it out.

No 2032 is just the size (20mm diameter, 3.2mm thickness), better branded ones work better and longer, at least in my computer.

Use Renata,Maxell,Energizer,Panasonic,Sony.
If you have not heard of them,dont buy!
Usually cost a bit more but well worth the extra.
Use 2016/2025/2032 in my vast collection of watches, buy in bulk from Hong Kong on Ebay, usually here in 4/5 days and a fraction of the UK price.
D.