Android Estimate Battery Capacity
I highly doubt you can tell nor force the system to charge to its maximum as that is the SoC that is handling the battery current, in which the kernel is periodically polling to measure the battery charge. 

(You could in theory mess with the values of the threshold within the kernel's specific battery module, but that could have unintended consequences, possibly damage to the battery long term!)

Observing battery state power limit is subjective and debatable as to each and their own, depends on what they are using on their handset - you're not going to get a concrete answer out of that. :)