Battery lifting: clamp tools and air balancers

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FullSharp · since 1991

Quick answer: Car and truck batteries of 12–65 kg are usually lifted with a side-wall clamp tool lined with acid-resistant rubber, hanging from an air balancer that runs on 6–7 bar compressed air. Air balancers suit 20–50 kg batteries best because they lift and lower quickly all shift long and use no electricity. The unit hangs from a 5T rail (200 kg working load), a jib crane or a freestanding frame. Above 50 kg, use a pneumatic hoist or a servo hoist.

"It is only fifty kilos, two men can carry it"

In battery plants we hear this most often at the end of the line, where the batteries have been filled, charged and are waiting to go on a pallet. A truck battery weighs 40–60 kg, and yes, two people can carry it. The trouble is they carry a few hundred of them every shift, bending down to the conveyor, lifting, twisting and setting each one on a pallet close to the floor.

Car batteries are lighter, around 12–25 kg, so one person handles them alone and nobody thinks about equipment at all. But lighter means a faster pace, and by the end of the day that person's back has still moved several tonnes. That is why battery lifting is a job we are regularly asked to survey, and why most stations end up with the same setup: a battery clamp tool hanging from an air balancer that runs on a rail.

What makes a battery awkward to lift

Weight is only part of it. The case is plastic and slippery, and there is often diluted acid or rinse water around the cover, so gloves slide. A filled battery has to stay level or the electrolyte comes out through the vents. And there are two terminals on top: touch both with a piece of metal and you get a spark.

So the first thing we ask on site is which batteries are being handled, because each size leads to a different grip and a different lifting device.

Battery type	Typical weight	How it is held	Equipment commonly used
Motorcycle and small batteries	2–10 kg	A whole row or tray gripped in one lift	Air balancer on a rail
Passenger car batteries	12–25 kg	Clamp on both side walls, or hooks in the carry handle	Air balancer on a 5T rail or a jib crane
Truck, genset and marine batteries	30–65 kg	Side-wall clamp with jaws seated under the cover ledge	Air balancer up to about 50 kg; pneumatic hoist or servo hoist above that
Industrial and forklift traction batteries	100 kg to over 1 tonne	Hooks in the lifting eyes through an insulated lifting beam	Electric hoist, servo hoist, overhead crane

These figures are common ranges. For a real project we take the weight and dimensions of the heaviest and the smallest battery the line runs.

The battery clamp tool is the part built around your product

The design we build most often has two jaws that close on the long side walls. The jaws are lined with acid-resistant rubber, ribbed to bite on smooth plastic, and they also seat under the cover ledge, so the battery cannot slip out even when the case is wet. The operator sets the tool on the battery, presses clamp, lifts, moves to the pallet and presses release. Both hands stay on the tool handles the whole time and never go under the battery.

If the battery has a carry handle, a hook tool is simpler, but we only suggest it when the handle is strong enough and the battery is not too heavy. On lines running small batteries it makes sense to grip several at once, a row of 4–6 for example, so each lift is worth the walk.

The tool frame sits right above the cover, next to both terminals, so we insulate every part that could touch them and use materials that tolerate acid fumes: stainless steel, anodized aluminum or epoxy-coated steel. When a plant runs a few battery sizes, the jaw opening adjusts within a range; if the range is too wide, quick-change jaws are the better answer.

Why the tool usually hangs from an air balancer

Palletizing batteries is repetition: lift fast, lower fast, a few hundred cycles a shift, every day. An air balancer is made for exactly that. The load hangs on a wire rope and moves faster or slower according to how hard the operator presses the button or pulls by hand, so people work at their own rhythm instead of waiting for the machine. A standard electric hoist cycled that often all day tends to overheat.

Air balancers are at their best with loads of 20–50 kg, which is where car and truck batteries sit. They run entirely on compressed air at 6–7 bar and use no electricity. That matters in charging areas, where hydrogen may be present and the plant has to control ignition sources. Electric hoists and servo hoists can work in explosion-protected areas too, but they have to be ordered as special models at a higher price.

For batteries above 50 kg, or where the load must stop precisely as it goes into a compartment, we move to a pneumatic hoist or a servo balancing hoist, which handles 20–750 kg and has a float mode. For a closer comparison, see our article on air balancers versus electric hoists.

Rail along the line, freestanding frame or jib crane

Where the air balancer hangs depends on the path the battery travels. If it is picked at one point on the conveyor and placed on one or two pallets right beside it, a jib crane with a 5T rail arm is enough. The arm swings easily, and a 3–4 m reach covers both the conveyor and the pallets.

When the working area is a rectangle, say a long stretch of line with pallets on both sides, we use a rail system. 5T is the steel profile code of the rail, and its working load is 200 kg, plenty for one battery plus the clamp tool. The rail rolls smoothly enough for the operator to move the battery with one hand.

Battery plants often have sheet-metal roofs, clean-room ceilings or a ceiling full of extraction ducts, with nothing to hang a rail from. In that case we put up a freestanding frame with columns bolted to the floor. Among the projects we have installed there are two-column frames and single-column frames carrying the rail; which one fits depends on where there is still room for a column.

A few safety points we always pass on

A pneumatic clamp tool has to hold the battery if the air supply fails. We fit a holding valve so the jaws cannot open when a hose comes off, and we place the release button where it cannot be pressed by accident while the battery is still in the air.

When the rubber pads wear or harden from acid, replace them; do not raise the clamping pressure to compensate. Wipe the tool with a damp cloth at the end of the shift, because dried acid slowly eats into bolts and joints. And as with any lifting equipment: nobody stands under a suspended battery, and nothing is lifted beyond the rated load.

Real projects installed by FullSharp

5T 200 kg Rail Jib Crane with Air Balancer and Battery Clamp Tool

5T 200 kg Rail Frame with Air Balancer and Battery Clamp Tool

Two-Column Rail Frame, 200 kg, with Air Balancer and Battery Gripper Tool

Single-Column Frame with a 5T Rail, 200 kg, for a Battery Factory

Equipment in operation (videos)

Air balancer compared with a pneumatic hoist

Customer testing an air balancer with a hook tool

Frequently asked questions

Can one person palletize a 50 kg battery alone?

Yes. The clamp tool holds the battery and the air balancer carries all the weight, so the operator only guides it and presses clamp and release. At the stations we have installed, one person now does what two people used to carry.

Will the clamp tool crack or mark the battery case?

Not if the clamping force is set correctly. The jaws are wide, rubber lined and also seat under the cover ledge, so the force is spread over the side walls. We set it by air pressure for the heaviest battery.

We run several battery sizes. Can one tool handle them all?

Within a certain size range, yes. Send us the smallest and largest battery dimensions and we will work out the jaw stroke. If the range is too wide, quick-change jaws are simpler and last longer.

Can an air balancer be used in a battery charging area?

An air balancer runs on compressed air and uses no electricity, so it suits areas where ignition sources must be controlled. Electric or servo hoists can do the job too, but only as specially ordered explosion-protected models at a higher price.

Does a 5T rail carry 5 tonnes?

No. 5T is the steel profile code of the rail; its working load is 200 kg. That is more than enough for a car or truck battery plus the clamp tool. For heavier loads we use the 500 kg steel rail.

Send FullSharp photos of your batteries, the weight and dimensions of the heaviest one, the pick and place positions and a few pictures of the floor area. We will survey the site and propose the clamp tool and lifting equipment free of charge.

Request a site survey See battery handling projects

Battery lifting in the factory: clamp tools, air balancers, rails