Stop pulling caps, stop guessing water levels, and stop spilling acid. The Pro-Fill BG-U48V-BJ turns watering an entire 48-volt deep-cycle battery bank into a single-connection, hands-free task -- every cell filled to the precise level automatically, every time.
The Flow-Rite Pro-Fill BG-U48V-BJ is a complete battery watering kit engineered specifically for 48-volt battery banks -- the standard voltage used in golf carts, industrial floor equipment, and an increasing number of larger RV and off-grid energy storage setups. It accommodates eight 6-volt batteries or four 12-volt batteries wired in series to reach 48 volts.
The system replaces the existing vent caps on each battery cell with precision automatic shut-off valves. A network of flexible manifold tubing interconnects every valve, so you attach a single water line at one fill point, apply gentle pressure, and all cells fill simultaneously. When each cell reaches the correct level, its valve closes automatically -- no overfill, no acid spill, no dried electrolyte crust to scrub off later.
Valves close when water reaches the correct level in each cell -- prevents overfilling and electrolyte loss.
Connect one hose or hand pump to the quick-connect port and water all cells at once -- no cap-by-cap access needed.
Designed for 8x6V or 4x12V deep-cycle flooded lead-acid battery banks -- common in golf carts, RVs, and off-grid systems.
128 flex manifolds route between batteries and cells with flexibility to accommodate varied battery tray layouts.
The BG-U48V-BJ ships as a complete universal kit. Contents include:
Flooded lead-acid batteries lose water during every charge cycle through electrolysis and evaporation. If plates are exposed above the electrolyte level, sulfation accelerates rapidly -- permanently reducing capacity and cutting battery life. A watering system makes the maintenance task quick enough that it actually gets done on schedule, protecting your battery investment.
This kit is the right choice if you are running a 48-volt flooded lead-acid battery bank in any of these applications:
"Universal" indicates this kit uses standard Flow-Rite valve sizing compatible with the most common flooded lead-acid deep-cycle battery vent cap thread patterns. Most 6V golf cart batteries (Trojan T-105 family, US Battery, Deka, Crown) and standard group-size 12V deep-cycle batteries use compatible vent openings. If your batteries have non-standard or proprietary vent sizes, verify thread compatibility before ordering.
Installation is straightforward and requires no special tools for most battery tray configurations:
The BG-U48V-BJ quick-connect fill port is compatible with Flow-Rite hand pumps and gravity-feed water bottles, sold separately. For high-frequency maintenance on multiple carts or a large battery room, a powered battery watering cart makes the job even faster.