If you're looking for a fast charger for you large 12v lithium batteries for RVs, campers, and van life check out the Victron Blue Smart IP65 15A Charger. It's waterproof, heavy duty and works great: https://amzn.to/3hyFZlU In this video, I review the Victron charger and show how I use it to charge my ExpertPower 12V 100Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery but this would work just as well with a Battleborn, Renogy, or any other Lithium Ion or LiFePO4 battery https://amzn.to/3WvKNHP