Just bought two holders off eBay and wire them in series and mounted them on a perpex sheet pic attached

Thanks. Sorry, didn’t make what I needed clear! I’ve got the Makita battery holders which I’ll connect up in series. I’m also going to add a 10A voltage regulator to bring the voltage down to 32v before it goes into the Swytch battery holder on the handlebars (the Max battery appears to do that too). What I‘d like to know is what connections you made inside this Swytch battery holder on the handlebars.

A new thread with an appropriate title should be started instead of hijacking someone elses thread, then in the future it may be easier for others to find.

I’m also going to add a 10A voltage regulator to bring the voltage down to 32v before it goes into the Swytch battery holder on the handlebars (the Max battery appears to do that too).

There's no logical reason Swytch would do that. Before doing anything stupid, you should open up your controller box and look inside. The last pictures showed only two wires to the battery connector, but for some reason, the guy wouldn't show pictures that were definitive.

I’ve been told to start a new thread on this, which I will. If you measure the charge connector in the middle you get full battery voltage (around 42v). If you measure at the output slots you get 32v. When the battery declares that it’s flat, the battery is 32.6v. I Accept that my crude analysis of this may well be wrong, but in my experience as a humble electronics engineer I would feel that there is a power transistor circuit in the battery housing taking it down to 32v in order to keep the feed at this voltage, and the 0.6v is the voltage drop across the semiconductor junction.

I’ve been told to start a new thread on this, which I will. If you measure the charge connector in the middle you get full battery voltage (around 42v). If you measure at the output slots you get 32v. When the battery declares that it’s flat, the battery is 32.6v. I Accept that my crude analysis of this may well be wrong, but in my experience as a humble electronics engineer I would feel that there is a power transistor circuit in the battery housing taking it down to 32v in order to keep the feed at this voltage, and the 0.6v is the voltage drop across the semiconductor junction.

You have a very vivid imagination. You should be a story write in the film industry. Wouldn't it be a good idea simply to look in the box and see what's actually there?

The Swytch needs needs 36v or more no need to drop it done you would get reduced power output.The oled controller shows battery voltage of 41.5 on fully charged battery anyway.