I looked up replacement batteries for the 10 V and the text on it indicates that the charge cutoff voltage is 4.48V. It’s not uncommon for high-quality Lipo batteries to be rated for higher than 4.2V charge voltage to “get more capacity” out of an otherwise smaller battery (sometimes at the expense of longevity).
Now, if only there was a way to replace the battery indicator with a raw voltage reading, I’d totally survive with that - that’s how I fly my drones, after all, start at 4.2V and expect to land around 3.5V.
Actually, is there a way to replace the battery indicator with a voltage reading?