Hello,
My Jam2 is roughly 3 years old as well, it has 4353 kilometers, I can still charge it to get all the bars lit up, but the last one goes away I would say in a couple of minutes after the start of the ride - not an uphill one. Moreover, when I get to 2 bars, after some additional riding...
Hi Valerio,
Have you managed to push forward your project, maybe?
My internal battery has lost some capacity already and I have also been thinking if it would be possible to use the 21700 cells somehow...