I recently switched to lithium batteries and added a Garmin livescope to my 2 helix 10’s. Every thing is wired correctly, each unit on it’s own circuit with proper gauge wires, etc. I have fished with new rigging 4-5 times with no problems. Every thing works as it should. Why does my battery voltage show 13.1 on battery monitor (ionics bluetooth), 13.1 on volt meter at battery post and 13.1 on volt meter at each power plug that plugs into each unit. All 3 units show 12.2 volts on each unit screen and every thing else 13.1. What’s the deal. Any ideas?