Slight concern over Kalkhoff / 50cycles / Focus posts

[nemesis]

i have the focus xt jarifa 27.5 impulse 2 off road motor 2015 model with the 17ah battery,i have also owned a bosch powered bike with a 11ah battery,the impulse motor has a definate power advantage over the bosch and with the 17ah battery for me it was a easy choice,both bikes are s class and the focus has shift assist and adjustable climb assist with four power levels,off road only and of course on private land.