@gazzaman2k as @GeorgeBoudreau mentioned he is using the AZ432 chip which is the same design as the v4.21 boards on the LEAF version.
AZ432ANTR-E1 = VOLTAGE REFERENCES 1.25V 18V ±0.5% 20PPM/°C SOT-23(SOT-23-3) ROHS
This part is currently out of stock on JLCPCB, a similar part is this.
TL432G-A-AE3-R = VOLTAGE REFERENCES 1.25V 15V 50PPM/°C SOT-23(SOT-23-3) ROHS
It should be a drop in replacement. There are other components that would work, but these are much more expensive.
Thanks for confirming the status of 4.3.
Have just ordered 4.21 with assembly from JLC (and controller board) - swapped in part LCSC part number C171461 for the voltage reference as mentioned earlier. Hopefully will work fine - not sure if anyone has feedback on that yet. If not, simple enough to hot air the part off and put on the original part ordered form somewhere else.
Now I just need to find the best place to order the Attiny841 from.
thanks but not avaliable from any uk supplier…i guess ill have to wait a month for the china boat to come in
@gazzaman2k have you tried mouser for the original part?
Voltage References 1.25V Prec Shunt Reg 1.25 to 18V 0.05Ohm
Mouser No:621-AZ432ANTR-E1
Mfr. No: AZ432ANTR-E1
Mfr.:Diodes Incorporated
I don’t think this has been tested yet, but I suspect it should be okay
i dont want to pay £12 postage for somthing i only need that costs like £5 
that £12 has got me 70 of them from ali express
ah screw it ive now got 200 of them comming for free postage… anyone need any in the uk let me know 
I ordered them from https://www.microchipdirect.com/product/ATTINY841-SSU directly following @BuffaloPowerWall who did the same
I ordered the D1 voltage reference from AliExpress: 3.78￡ 12% OFF|100% New Original Sot23-3 Lm4040aim3-2.0/nopb Patch 2.048v Voltage Reference Source Free Shipping Best Match - Accessories - AliExpress shipping was decent to NL (10 days or so)
Hi there
Is there any chance to order pre assembled battery module boards by JLCPCB?
I was trying to do it but there are two components that not being selected and they are
ATTINY841-SSU
AZ432ANTR-E1
Thanks
At the moment you can’t get them fully populated by JLCPCB as they don’t have the ATTINY (and possible one other now) component. You will have to order them mostly populated and solder on the ATTINY yourself.
Hi again George, i have again been having a play around with the boards today, so i removed the attiny, the opto coupler, R9/R31, R27/R5, R28/R6 & the voltage reference.
i put the IRLML6244TRPBF from v4 as the octocoupler, replaced the 2.2k from R9/R31 with 1.8k as per v4, replaced the 68k from R27/R5 to 475k as per v4 and also the 27k from R28/R6 to 402k as per V4 and put 2 brand new ATTiny841 and two new voltage references ADR5040 again all from V4
so now basically the board is a V4 x 2 using all the same parts as a V4
i hooked it upto my bench voltage power supply put 3v output to get the device to communticate to the controller, measured the voltage and corrected it in the module page…
turned the voltage upto 3.8… no movement, 4.2 no movement either
ive tested the cableing with v4 board again on the bench power supply and that increases/decreases with what the display shows fine.
i think there is an issue with the traces, its amlost like its not receiving the voltage from the battery, the devices power up fine but the attiny isnt reading any voltage changes what so ever?
thanks
Gareth
Can you measure the voltage at the attiny ADC pin, check the resistor divider circuit is working and not shared to ground or positive
on the voltage ref both the bottom pins are commoned together, then they go to the c2/c5 (c2) and then to r4/r26 (r2) then to aref pin13 and the top pin is grounded…
on the v4 the bottom left goes to the cap c2 then onto r2 then to aref the bottom right is gnd and the top is nothing…
thats the problem, too late to go into the garage to sort it ill look into it tomorrow and report back
seems so the AZ432ANTR-E1 uses 3 pins soldered and the ADR5040 only uses 2 pins… if i solder it on a angle it should sort my problem, once the AZ432ANTR-E1 arrive in the post ill build it how it is supposed to be
Hi Gareth,
Are you referring to AZ432ANTR-E1?
I’m from Belgium and need ±25.
Thanks in advance!
It’s not just that, the device operate differently, there may be other components linked to them as well.
yes i should have some by mid next week
Is there any chance to have this picture from the top view?
Thanks
Got it working now 
