Stop hauling jugs and guessing water levels. The Flow-Rite BA-MS-652 delivers precise, spill-free battery watering for smaller banks -- up to 24 cells -- using a 12V DC pump powered directly from your battery system via ring terminals. Everything needed to get started is in the box: pump, 5-gallon tank, and a pre-wired 5-foot harness.
Flooded lead-acid batteries need regular watering to prevent sulfation, plate damage, and premature failure -- but overfilling is just as damaging as running dry. The Flow-Rite BA-MS-652 pairs with Flow-Rite's single-point watering valves to fill each cell to the correct level automatically, then shut off. No guessing, no spills, no acid on your hands.
This mini assembly is sized for light-duty battery banks of 24 cells or fewer -- roughly a 6-battery, 12V bank wired in series-parallel, or equivalent 6V/8V golf cart-style configurations. It is the right choice for smaller RV house banks, small solar storage systems, or maintenance carts where a full-size pump assembly would be overkill.
Designed for banks up to 24 cells -- ideal for 4 to 6 battery RV or solar setups.
Enough capacity to water most small banks several times before refilling the tank.
Powered from the battery bank itself via ring terminals -- no separate power source needed.
Pre-wired harness gives enough reach from battery terminal to pump without extension splicing.
Flooded battery cells must be maintained at the correct electrolyte level -- typically just above the plates but below the fill collar. Overfilling dilutes electrolyte concentration and causes acid overflow during charging. Underfilling exposes plates and accelerates sulfation. Flow-Rite valves used with this pump assembly shut off automatically at the correct fill height in each cell, making consistent watering fast and accurate without tools or measuring.
This kit includes the pump, tank, and power harness only. Flow-Rite single-point watering valves and manifold tubing for your specific battery model must be purchased separately. Confirm your battery's terminal layout and cell count before ordering a valve kit. Flow-Rite offers valve kits matched to specific battery brands and configurations.
The BA-MS-652 is well suited for:
The ring terminals on the 5-foot harness connect directly to your battery bank's positive and negative posts. The pump draws 12V DC and activates when you connect power to begin pumping water from the tank through your watering valve tubing. Always connect the watering valve tubing to all cells before activating the pump. Disconnect power and stow the hose after watering is complete.