Yes the switch was incorporated to select 2-6 cell. Stolen from Google! In the post it was advised to get a "break before make" switch to avoid accidents
but I'm going for a straight 6 or 4 lead. No switch required! Theoretically my b6 will automatically recognise them and charge accordingly.
On the subject of b6, my 99p Guangzhou psu popped last time I used it! Charger fine - using the car ATM! That'll teach me. Any recommendations for a UK variety?
Cheers