Voltage regulator rectifier for LiFePO4 battery

JohnDB

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Equipment
M4500DT
Jun 9, 2018
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This might also apply to changing the lead-acid battery on your tractor to LiFePO4, but for me its about my Honda TRX500 quad bike.
Specs for LiFePO4 automative 12V batteries say the charge volts needs to be 14.6VDC or less to avoid damaging the battery - even if the battery has a built in battery management system. The quad bike goes up to 15.5VDC, is there a simple reliable way I can reduce the 15.5 V to not more than 14.6? Charge current 400W at 5000 rpm.
Charging system specs:
1721085015769.png


Aftermarket VRRs are available to convert to LiFePO4 but I'm keen to avoid the hundreds of dollars cost.
Thanks for your help.