Hello!
It's quite lucky concatenation of circumstances that I've seen your project description.
I was engaged in such project. We together with my teammates (engineers) have completed similar task (battery testing/charging board + interface software, which communicated via RS485 with PC).
The heart of them problem is definitely clear for me.
I've got real experience in electronics development ( circuit design concept, schematic, BOM, prototype) and software/firmware development ( different MCU).
I feel myself a really good fit for this project.
Let's work together and discuss the project (my approach, details of implementation, your requirements and the standard itself, methodology of measurements, GUI of interface software you require, etc).
And of course I will provide circuit design concept, schematic, BOM, interface software (documented and tested.
I'm online now and every day since 8.00.
Looking forward to hear from you soon!
Best regards,
Vitaliy