It's purely voltage related...
Limit voltage to a maximum of 14.7 or 14.8 and let the battery decide how much it wants to take. Maximum Charge Acceptance. MCA implies charging is controlled by voltage, and hundreds of millions of car batteries have enjoyed this form of charging for many decades.
TEN amps at 15.4 volts is too much. Too much even for equalization (2X excess) and way far gone out of range for top charging a single battery.
Voltage controlled Charge Acceptance maximum is the most economical way to recharge batteries using a generator.
I ran a test long ago with a Honda 1500 belt driven generator. A single group 24 battery. MCA charging saved more than 20% in fuel over recharging at a C10 rate. Money is money is money.