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i mean if You are a DIYer You can "copy and paste" this project this is 12s2p extender, 24 18650 cells and smart BMS perfecly fits this fidlock bag ,I m using dual battery converter from Aliexpress that alows me conect and disconect at any time

I can share ready solution for 250wh range extender

$$$$ ?

Please show us range extender,did You use dual battery adapter to connect at any time ?

not possible tachnically i think 410wh battery 12s2p so only 2cells working together when you load 500w at only two dischcharged cells voltage drops dramaticly ,bms cut off voltage and ride finished :)

Battery under 20 percent u have only 120w max in all modes

Yes

Try 43v soft from post #4

Where is speed sensor?

This is bad ,U have less power and road assist characteristic ,get software for mtb then spend 150 usd for besst tool and flash it

This is also e road firmware 43v 10amp

Why they send people engine with road or gravel software for cef50 or lce 930 frame

Cassete teeth?

CRX30PC4310E102001.5 Hi folks is it road or mtb software ?

For me it was nightmare.

my build

Just swap left pivot bolt with right one, of them is more flat

Also Poland here :)

What about disasembling bosch battery and do the conection for extender before orginal BMS ?