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Very true Daniel, Clive did just ask for LBS to help out. Being a helpful lot we do like to help folks to try and save them money by testing/checking themselves, though not every one feels confident diving in.

For sparking I use a parallel Y lead using XT90 anti spark connectors, would be nice if they also did this to the XT60. Like Benjamin I use batteries of differing capacity and now and then during a ride I check them during a stop, voltages are usually within 0.1v.

Not seen one constructed like that on a tree Eddie, you are wise to keep your distance. Though fairly docile away from the nest any disturbance, vibration or sign of a threat then they will defend it.

You can test via Julet's if you have a spare or old cable to the controller , you simply cut off the connector at the controller end and bare the wires to see the colours for testing.

Wire them in parallel and have one big ah/wh battery.

This is quite typical of issue from posters, in that they never divulge the whole story from the start and leave out vast sections of what has occurred. It would save a lot of us a wasted time in replying.

It is possible the shunt might be on the underside of the pcb.

Never watched it.

The main discharge and charge points utilise pads on the reverse of the board. The pads we can see on top in the pic on post#13 are a 5v power supply for the switch/leds and usb output.

Have you carried out a Mosfet test on the controller to see if one has failed or failing ? The controller has many components and is impossible to check except for the mosfets and a visual generally for anything that looks damaged like a resistor. Disconnect the battery and probe between the...

It doesn't need much just a smidge.

I would consider one of the new Wisper offerings as they are UK owned, designed and assembled in UK/EU or a Woosh for the same reason, no use any one saying 'but they are made in China/Taiwan' because all bikes are even Bosch , Yamaha and steps etc,etc. They may be put together in Germany or...

Best fuse pic I can find, if you need other pic Q's just ask away I might be able to find more, the fuse is also T'd off to the charge inlet and as previously mentioned the v+ with white sheath is to the discharge connector.

For you my old oxydrive bms pic

The fuse is connected to the v+/red on the discharge side , inline on the v+ from cell group #10 and the battery discharge connector.

I opened my one when it was brand new which might have made it easier and then added a bit of copper slip to the thread to make future opening that much more easier.

By your picture your hub is a modern geared brushless hub as the label states it so Alan.

Here you go Alan the ' rare bit of history thread' enjoy. https://www.pedelecs.co.uk/forum/threads/a-rare-piece-of-history-swizzbee.25683/

With your faulty motor/bike disconnect the motor cable and turn the wheel fwd by hand is it free, like wise rwd you should feel some slight resistance. If it freewheels easily fwd then there is no phase wire short, if it doesn't then you have phase wire short caused by a damaged motor cable or...

Clive can you tell us what is wrong or what occurred before it went wrong ?