I have installed these chargers on my boats and they provide years of battery life. They also keep them fully charged. I install them permanently and connect them to the battery switch. Add an external shore power plug and you're done.
π Renogy Wanderer 10 Amp Solar Charge Controller Regulator with Bluetooth Module for 12V/24V System
5 Review
Battery Tender Plus 12V Charger and Maintainer | Motorcycle, ATVs, and More - 1.25 Amp Automatic PowerSports Battery Charger | 12V Battery Chargers - Model 022-0185G-DL-WH
7 Review
π Battery Tender USB Charger Adaptor: Charge Mobile Devices on the Go with 12V Vehicle Battery - 081-0158
5 Review
BougeRV Extension Female Connector Adaptor
3 Review