I'm contemplating getting a Sony battery's PCB flex soldered to a Samsung S8+ battery. This due to new official genuine products proving impossible to find for a 2014 device now, especially with a battery manufacture date within two years. Also there's no reputable third party manufacturers either.
Photo of S8+ battery. It's a significant upgrade in power to make it worthwhile while fitting decently, otherwise any other model may work. Successor Sony batteries have a different arrangement of the PCB flex which is why a transplant modification is going to be necessary either way. This XDA forums thread demonstrating removing the PCB flex from an older genuine Sony onto a third party battery helped inspire me.
The specific question is about the S8+ battery being 3.85V Nominal, 4.4V Charge. Whereas the Sony i'm coming from is 3.8V, 4.35V. Will that be a problem for the PCB or phone in general to accept? Is the only difference that the PCB/motherboard will be limited to charging the new battery to 4.35V?