While many controllers share general design characteristics, there's literally thousands of designs of controllers, so without at least knowing which specific controller model you have, no one is really going to know which specific parts you're referring to. (and only then if they have done this on that model).
Even better is a good set of clear, well lit pictures of your board(s), attached directly to your post (rather than linked offsite where they may not be visible/accessible). Overview of the board, both sides, then closeups of the specific areas your'e referring to, marking the parts you've found, along with any schematic diagram you've drawn up, if any.
Next, a few considerations, in case you havent' thought of them, or run into them later. It might operate fine without changing anything...but it might need several changes.
Are all the max voltages of all the parts in your controller for battery-connected sections able to handle above the max fully charged battery voltage you expect? If not, you'll want to change any of those parts out, or risk failure.
This is usually the FETs on the big heatsink bar, and the largest can style capacitors.
Some of these parts are the inputs to the low-voltage power supply (LVPS), which is probably the parts you're talking aobut; on some of them they have a wide input range, but most are setup for the voltage they're marked for, with some amount of leeway. There's two basic kinds. One is a simple linear regulator, usually LM317 with a small resistance in high-wattage resistors between it's input and the battery; these would be changed to higher resistance for a higher voltage, proportional to the existing resistance and voltage. The other kind is an SMPS, which will still have some limit to it's input range without figuring out what they did for an input stage, and changing it to whatever is needed for the higher voltage (if any); it might be input resistors as well, or other parts.
There's a few bits in a controller that may need to be changed to make it operate "normally" at a higher voltage. First there's the stuff above, just so nothing fails. Then there's the HVC, so it doesb;t shutdown due to too high a voltage. Then there's the LVC, so it will correctly shutdown for your battery's low voltage cutoff. Both of those are probably controlled by the same voltage divider resistors somewhere near teh MCU chip, though they could be located anywhere, and just have the middle of the divider go to the MCU.
