A compact, light-duty pump solution for watering flooded lead-acid battery banks with 24 cells or fewer. The BA-MS-650 delivers consistent, controlled water flow to each cell without overfilling, keeping your RV or golf cart battery bank properly maintained and extending battery life.
Manually topping off flooded lead-acid batteries with a jug or squeeze bottle is slow, messy, and easy to get wrong. Overfilling accelerates corrosion; underfilling shortens battery life. The Flow-Rite BA-MS-650 takes the guesswork out of the process with a submersible pump and a built-in flow indicator that gives you a visible confirmation that water is actually reaching each cell.
At 5 feet of tubing, the BA-MS-650 is sized for smaller battery banks -- think a single 6V or 12V bank in an RV, a small golf cart pack, or a marine house bank. If your system runs more than 24 cells total, step up to Flow-Rite's full-size pump assemblies.
Drop into any standard water jug or container. No priming needed -- just submerge and pump.
Visual confirmation that water is moving through the line, so you know every cell is getting serviced.
Pre-attached tubing gives you enough reach to work a compact battery bank without extensions.
Right-sized for small RV, marine, or golf cart battery banks. Not designed for large multi-battery arrays.
Flooded lead-acid batteries -- including most golf cart batteries, many RV house bank batteries, and marine deep-cycle batteries -- consume distilled water during normal charge and discharge cycles. As electrolyte levels drop, the plates are exposed, which causes sulfation and permanent capacity loss. Regular watering (typically every 2-4 weeks under heavy use, or monthly for lighter use) is one of the most impactful things you can do to extend battery service life.
The Flow-Rite system replaces the fill caps on each cell with quick-connect valves. The pump assembly attaches to those valves and delivers a precise amount of distilled water to each cell -- stopping automatically when the cell reaches the correct level (when used with compatible Flow-Rite battery caps). The BA-MS-650 handles the pump and delivery side of that system.
The BA-MS-650 is designed for use with flooded lead-acid batteries only. This includes:
At a 24-cell maximum, this pump is well suited for a 12V bank of four 6V batteries (8 cells), a 24V bank of four 6V batteries (8 cells), or a 12V bank of four 12V batteries (24 cells). For larger arrays -- a six-battery golf cart pack or an expanded RV house bank -- Flow-Rite offers higher-capacity pump assemblies in the BA-MS and BA-ES series.
The BA-MS-650 pump assembly is the hand-operated delivery component of the Flow-Rite battery watering ecosystem. For automatic shutoff at correct electrolyte level, the battery cells must also be equipped with Flow-Rite QDV (quick-disconnect valve) battery caps and a manifold or individual cell valves. If your batteries are not yet fitted with Flow-Rite caps, the pump assembly alone will not provide automatic level control -- you will need the complete cell cap kit for your specific battery type as well.
Always use distilled water when watering flooded lead-acid batteries. Tap water contains minerals that contaminate the electrolyte and permanently reduce battery capacity. The BA-MS-650 pump and tubing are not affected by distilled water, but using any other liquid will void the battery warranty and damage the cells.