An uncontrolled battery charger would be bad, unless your battery is already in the shitter.was i reading right or did someone here say battery tender is actually bad for the battery... why?
A battery tender is just a float charger, if the battery is fine, it doesn't charge it, it only charges when the battery depletes(from storage for example)
To ped, Yes the stator "charges" at idle, but there's not a whole lot of current being "charged". The faster the crankshaft spins, the more power the stator generates. This is why in the user manual it suggests maintaining an RPM of 5,000 while riding to maintain a good charge.
So yes, you are technically correct that it charges at idle. But no, it's not a full charge and if you idle for 3 hours you can still run the battery down.