5 Best Battery Filler Bottles with Automatic Shutoff – 2019

Last updated on December 22nd, 2019 at 11:41 pm

The battery electrolyte level in a deep cycle battery needs to be checked regularly. This is because a lot of water is lost when gassing takes place during the electrolysis process. As a result, the ratio of water to sulphuric acid drops, causing the battery electrolyte to lose strength. This also affects the battery capacity and the overall performance. Sometimes if not checked, the electrolyte level might run very low uncovering the battery plates. The plates then become predisposed to irreversible damage. To ensure optimal performance and prevent damage to the lead acid battery in your car, golf cart, or microgrid system, you need to top up occasionally with battery water. This can be done very efficiently using a battery filler bottle.

A battery water filler is a bottle designed for topping up battery water to batteries without overfilling. It is designed to automatically shutoff when the right fluid level is reached. Although adding water to battery can be performed without using a designated equipment, it is more efficient and effective to use a battery filler bottle. Otherwise, you might spill a lot of water while trying to aim at the small battery vent. In addition, water spills can also make a smooth floor slippery and dangerous to walk on.

Top 5 Best Battery Filler Jugs

Performance Tool W54274 Battery Filler (2QT)Plews LubriMatic 75-030 2 Quart Professional Battery FillerMightyMax Deep Cycle Battery Water FillerOTC 4621 Two-Liter Battery FillerStone River Battery Water Filler
Users' Ratings
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  • Shuts off automatically when battery cell is at proper level
  • Has a spring loaded filler valve
  • Made of durable injection molded plastic
  • Has an opening for adding water
  • Shuts off automatically when battery cell is at proper level
  • Nozzle is fitted with a double action fast flow valve tip that prevents after-drip
  • Has a tough polythene construction that is not corrosive with acid.
  • Shuts off automatically when battery cell is at proper level
  • Made of acid proof tough polythene
  • Material is resistant to automotive fluids
  • Has a double action fast flow valve tip that prevents after-drip
  • Shuts off automatically when battery cell is at proper level
  • Nozzle is fitted with a double action fast flow valve tip that prevents after-drip
  • Has a tough polythene construction that is not corrosive with acid.
  • Has a shutoff valve
  • Nozzle is fitted with a double action fast flow valve tip that prevents after-drip
  • Made of tough polyethelyne material
    Has an opening at the top for adding water
  1. Filler cap fits tightly to avoid air leakage
  2. Sturdy body to withstand the force of pressing it down on a hole when adding water to battery
  3. Fairly priced
  1. Safe to use with battery acid
  2. No danger of overfilling or spilling
  1. Inexpensive
  2. Very easy to use
  3. Easily accesses very tight places
  1. Easy to use
  2. Easy to add water into the device through the hole at the top
  1. very easy to use
  2. Has a top opening for adding battery water
  1. Can overfill battery if the cap is not well-fitted
  1. Has only one opening for both adding water and fitting the nozzle
  1. You have to push down hard to get water to come out
  2. The plastic is so thin that the filler bottle bends when you push the spout hard into the battery
  3. Spout easily crosses threads when reinstalling sometimes
  1. Battery filler does not work well when filler cap is not torqued properly
    Water leaks at the spout
  • The auto-shutoff often fails to stop water from flowing
    The battery filler is not strong at the seams
  • May overfill batteries
  • Dimensions 5 x 9.6 x 10 inches 5 x 8.6 x 9.7 inches 7 x 5 x 9 inches 5.8 x 9.8 x 10.9 inches
    Weight 16 ounces (454 grams) 6.4 ounces (181 grams) 5.6 ounces(159 grams) 14.4 ounces (408 grams) 6.4 ounces (181 grams)
    Capacity 2 Quartz (2 Liters) 2 Quartz (2 Liters) 2 Quartz (2 Liters) 2 Quartz (2 Liters) 2 Quartz (2 Liters)
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    Battery Filler Jugs Detailed Reviews

    Performance Tool W54274 Battery Filler (2QT) With Auto Shut Off

    The Performance Tool W54274 Battery Filler is similar to the LubriMatic filler in the sense that they both have an automatic shutoff nozzle and a 2 quartz capacity. However, this unit is different because it has two openings; one at the top for adding battery water and the other one for attaching the spout. Its spout has a spring-loaded valve that prevents the nozzle from getting stuck after you press it down into the battery cell vent to release water. It is also made of durable injection molded plastic that makes it strong enough to withstand the force when pressed down.

    Verdict: The Performance Tool Battery Filler is designed to eliminate chore from watering batteries and is a must have especially if you have multiple batteries to refill. It is ideal for refilling golf cart batteries. It is also the cheapest among the best battery fillers and certainly a good value for your money.

    Plews LubriMatic battery filler

    Plews 75-030 auto shut off 2 quart capacity plastic battery filler is a good addition to the tools and equipment for the maintenance of deep cycle batteries. It is indeed a very clever way to retire the funnel you use to add water to the golf cart batteries, your car battery or the batteries in the solar shed. Fitted with an automatic shutoff valve, the filler helps prevent overfilling cells or spilling water when refilling batteries hence keeping the battery top and the floor dry. It has a 2 quarts capacity, enough to refill a bunch of batteries before the next replenishment. Its valve tip is a double action fast flow type that helps prevent after drip hence ensuring that you don’t get into contact with the corrosive battery electrolyte. The filler is made of tough polyethylene that makes it safe to use with battery acid.

    Verdict: The LubriMatic 75-030 2 Quart professional battery water filler is a little handy long-lasting tool that increases safety and efficiency in the battery water refilling exercise. It is ideal for batteries with vents that are least 5/8″ wide.

    MightyMax Deep Cycle Battery Water Filler Review

    When you are working in a garage, you are likely to touch different automotive fluids. The last thing you want are tools that will degrade on coming into contact with those fluids. The MightyMax Deep Cycle Battery Water Filler is an ideal water filler for use in such an environment. It is designed to be exceptionally resistant to automotive fluids that are likely to come into contact with it during the process of servicing batteries. The filler has a single opening like the LubriMatic filler that is used for adding battery water to it and for attaching the spout. Its spout or nozzle features the double action fast flow valve tip that prevents fluid from dripping after withdrawal from the cell vent.

    Verdict: The MightyMax Deep Cycle Battery filler is a good choice for filling auto batteries and generally for garage use because of its resistance to automotive fluids. The downside, however, is that it is not sturdy enough and may tend to bend when pressed down hard.

    OTC 4621 Two-Liter Battery Fill Bottle

    In case you are looking for a battery filler made of heavy plastic material and looks durable, then you should add the OTC 4621 Two-Liter Battery Filler to your tool kit. It has two openings like the Performance Tool battery filler although it feels sturdier and costs three times more.The fill cap fits tightly without allowing any air incursion, which is very critical for the filler bottle to operate as intended. It also dispenses water quickly and easily and stops exactly when the cell is full to about the lower line.

    Verdict: Although the most expensive, the OTC 4621 Two-Liter Battery Filler is durable, easy to add battery water without removing the spout, and easy to use. It is a good alternative to your funnel and flashlight and of course, it spares your back!

    Stone River Golf Cart Waterfiller

    Albeit scoring a high failure rate among buyers, Stone River Battery Filler is a good way to eliminate the mess found with funnels with its drip-free design. It is made of tough polyethylene material to ensure durability and has two openings like the OTC 4621. Although it boasts having an automatic shutoff nozzle, many buyers claim that it fails just after a couple of uses. It also needs a good amount of pressure to push it down into a battery cell opening.

    The plastic is so thin that it bends when a good amount of force is used on it. Although there are very good units, chances of getting one that falls apart after a couple of uses or one whose valve doesn’t shut off are also very high.

    What is a battery filler?

    Deep cycle batteries are commonly used in various applications to store electrical charge. You will definitely find arrays of them in the solar shed of a solar energy plant where they are used to store electricity generated from PV modules. Similarly, you will also find stacks of them inside the golf carts for storing electrical energy for driving the small vehicles. Under the hood of your motor vehicle, you will without a doubt not miss one. In order to ensure optimal performance and increased lifespan of your flooded-type lead acid batteries, you need to occasionally carry out some maintenance practices. Two of the obvious procedures that are also actually interrelated are:

    1. Checking the strength of the battery electrolyte.
    2. Checking the battery electrolyte level.

    The first procedure involves using a battery hydrometer to measure the specific gravity of the battery electrolyte. The readings are recorded, temperature corrected and then compared against the voltage measured across the terminals of the battery to determine the state of charge and the overall health of a battery. The second procedure involves checking the level of battery electrolyte and topping it off with battery water accordingly to the correct level. It is very important to ensure that you don’t overfill or underfill the battery.

    There are several ways of adding water to battery, which include using a funnel, pro-fill watering kit hand pump, battery filler bulb, hydrometer, or a battery filler. However, to avoid spillage and overfilling of batteries, a battery water filler is the most effective and efficient tool. It is a relatively cheap, easy to use, handy little bottle fitted with a spout for feeding water into a deep cycle battery to the correct level. Most of the battery filler jugs have nozzles fitted with automatic shutoff valve that detects the level of electrolyte and automatically cuts off the flow of water to avoid overfilling.

    While they come in different sizes, colors, shapes, and structure, battery water fillers function almost the same way. Actually, most units don’t even ship with user manuals, which makes using the tool a bit difficult for the first time user. The following is a standard procedure for using all the battery filler bottles reviewed in this article and almost any other.

    How to use a battery filler in seven simple steps

    The following is a simple seven-step procedure for using a battery filler bottle when maintaining your deep cycle batteries.

    1. Fill the battery water filler with battery water.

      Normally, you will come across two types of battery filler bottles; ones with only one opening and those with two. For fillers with only one opening, you will have to remove the spout or nozzle in order to fill the cylinder with water. Then replace the nozzle and torque it tightly to prevent water from spilling. For battery filler jugs with two openings, remove the bottle cap at the top, add battery water, then replace the cap and torque tightly to prevent air incursion.

    2. Remove the vent cap from the battery cell.

      Ensure you are wearing your safety goggles and a pair of latex gloves to avoid corrosion with acid.

    3. Direct the spout to the battery vent

      Stick the nozzle of the battery filler into the battery hole perpendicularly and press it down. Water will flow through up until the level of the electrolyte rises to the tip of the nozzle.

    4. Refill Battery to right level

      You will also hear the water gurgle as it flows into the cell. Assuming that the battery filler has an automatic shutoff, the flow, as well as the gurgling, will stop as soon as the required level of electrolyte is reached.

    5. Withdraw battery filler and move to the next cell.

      Move to the next cell and remember to refill the bottle whenever it runs out of battery water during the exercise.

    6. Replace battery vent caps

      Once complete, replace the battery cell vent caps, wipe the top and drain any remaining water from the filler bottle.

    7. Store your filler bottle in a safe place.

      Rinse the filler bottle and store it safely in your tool storage area.

    Always remember to rinse your battery filler with fresh tap water before storing it in your toolbox!


    An electrical engineer by profession who used to work at a solar microgrid firm as an O&M supervisor. There, he realized that having the right tools for the trade is equal to getting the job half done. That's what inspired him to start this website!

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