Robust 12V to 48V charger, 12 Volt DC input battery chargers to use in 12 Volt systems, charge a 48V lead acid battery from a 12V source, heavy duty marine
Sterling Power battery to battery charging system - DC to DC smart battery charger, marine grade DC powered charger 12v to 48v
SEC Model 6958 12 Volt to 48 Volt High Power Battery Charger
CHINS Bluetooth LiFePO4 Smart 48V 100AH Lithium Battery+ 48V 10A Lithium Battery Charger for Golf Cart - Walmart.com
12V volt to 48 volt DC/DC battery charger for lead acid and lithium batteries (common negative) 1250 Watts Robust, marine, heavy duty from PowerStream.
Amazon.com: Beleeb Multi Voltage Battery Charger 12V 24V 36V 48V 60V 72V for Lead-Acid and Lithium-ion Battery,Trickle and Desulfator, 19lb, Black : Automotive
48V 18A Lithium Ion Battery Charger - i4818OB - Pro Charging Systems
Source Portable Electric Vehicle 12 Volt Auto Power Supply 12V 24V 36V 48V 72V 2A 4A Car DC To DC Lead Acid Battery Charger on m.alibaba.com
AC Converter / Battery Charger 36V & 48V Smart Charger 25 Amps - AIMS Power