[Cheatzy] active device to cheat the original BMS with higher capacity batteries

As already announced here , I have completed the test with the cheating device and therefore I want to propose it to your attention.
Cheatzy is an active device, based on a 16-bit ADC (analog to digital converter) and a DAC (digital to analog converter), both controlled by a CPU, which cheats the original BMS of the Twizy, by manipulating the current value provided by the battery current sensor.
You know that when you convert the battery to new cells, usually with a higher capacity, and your hold battery had a reduced SOH, you will face the so-called "reserve canister effect", i.e. you will reach 0% SOC before the battery is really empty, and turning the Twizy off and on, you will gain some extra SOC. This happens a few times, until the battery is really discharged.
This effect isn't so nice, because at these low SOC percentage, the Twizy has a reduced power and driving it in this condition isn't so fun.

Cheatzy is designed to avoid this effect.

Since it is an active device, the real current consumption is constantly monitored, so, for safety, if it reaches a limit value for a certain time, the real current value will be sent to the BMS, so that the BMS can react by activating the warnings and overcurrent protections of the system.
You can also decide wether to enable or not cheating even during charging/reku, in order to preserve your SOH from unmotivated / premature degradation.
The cheating factor is fully customizable, simply by moving the dip-switches on the device, in order to adapt it to the SOH of your BMS.
Once opened the battery, the installation is plug & play: unplug the current sensor connector and connect Cheatzy.

I would be happy if someone else could test the device.
I have the components to build 5 more units.
Since I consider them as "test units", I ask 80 euros + shipping costs each, with a return policy condition: if you are not satisfied with the device I'll refund you.

That's it, and please remind it's an hobby project, so if you join it you do it at your own risk, because I take no responsability for damage or other issues arising from its use.

Thanks to Berthold and euver for the original idea of working on the current sensor to cheat the BMS, to Snorre for testing the very first prototype which gave uncertain results and for the enlightening insights to improve its functioning, and to Miata for lending me his 39% SOHed BMS, subjected to my extreme tests.

Some photos of the device:
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Aktuell nutze ich ja den Bypass um den Reservekanister Effekt zu reduzieren. Leider ist, wenn das BMS eine niedrige SOH gespeichert hat, der Effekt immernoch da. Würde daher für hartnäckige Fälle gern mal dein Gerät ausprobieren.

Die Alternative wäre ja das neue BMS, welches Plug and Play passt, aber ein Vielfaches kostet

Jack-Lee schrieb: Würde daher für hartnäckige Fälle gern mal dein Gerät ausprobieren.

It's no clear to me: do you want one?

Yes, i would test one.

Basic instructions for setting the cheating factor.
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If you are unsure about the exact capacity of the new battery, I suggest to round up a little more.