Unfortunately, most

There are for Power4All series unfortunately no major battery. the 2.0Ah uses 5x 18650 li-ion cells, each with 2000mAh, where there are already high current cells with 2800 mAh. Total incomprehensible.

In a larger package could be installed on 5 series at 2 paralell, which would then 5200mAh but neeeein the few cm would indeed be too unwieldy.