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As said I do not want to change the gears at either end, also because I find 25km/h too fast on a wobbly 20" folding bike. The 20km/h are very comfy for my old age and non-existing excercise level. I have no clue why anyone wants to 'hack' these bikes to run 20mph (32km/h); ridiculous. That's...

@sjpt: None of the documented tweaks for setting changes (brakes, buttons, switches) seems to work. At least I feel vindicated that my original observation (higher speed after 3 charges) was NOT accidental, but a planned run-in by the manufacturer. I did find several similar comments in reviews...

Sorry, I have not updated this topic for a while, was too busy fiddling and riding... Here is how I solved my issue with this ONE-POWER-MODE controller, as I could not reset it to the factory mode of Vmax=20km/h: As the PAS would always trigger the full power mode whenever pedaling I made it...

Sorry for the late response (I was too busy riding and fiddling..): No, that does not work, as the bike only knows ONE power setting (FULL) and only one mode (kick power in whenever pedals are mov ing). So it will always push to 25km/h when pedaling. See my final 'exam' below for details.

Chapeau, Andy! But IMHO foldable bikes are not really made for speeds above 20km/h. Even back in the 1970s when they became popular. 'Duomatic' was their biggest feature, a simple 2 speed hub. Even if I change the overall ratio of the gearset I'd still feel rather unsafe on this el-cheapo...

@Andy: thanks for your various thoughts! To clarify: the bike has RWD, the black box under the crank contains the controller. PAS is actually a nuisance on this bike: it overrides any (lower) handle grip setting and will push the speed up to the new limit anyways. That's why I decided to remove...

Cool idea!! YES, that sounds rather reasonable, thank you! Nobody brought this up in the German forum. I do not know much about "BMS" (must study!), but understand that packs of batteries must be 'in sync' to operate efficiently. Maybe my cheap controller does a 'run-in' like balance load...

There are none, that's what I tried to explain. It would not have bothered me if the bike had maintained the original, comfy top speed.

So I got your attention, that's great! First and foremost: this is a TRUE story, as weird as it may sound. I searched the internet, contacted the company (thanks, David Hou @Samebike, for ignoring my support request!), nobody ever mentioned what I experienced. Then I asked for help in a German...