Surlon Power LFP | Floor Scrubber Lithium Battery 24V 135Ah

Floor Scrubber Battery Overview

The FB03 is a 24V-class LiFePO4 battery for floor scrubbers that would otherwise run a lead-acid set. Nominal voltage is 25.6V, capacity 135Ah, stored energy 3456Wh, and the cells sit in a steel case. It is the mid-size build in our floor scrubber range, between the 105Ah pack and the larger 150Ah, 205Ah and 230Ah versions.

We supply this 24V 135Ah LiFePO4 battery pack to cleaning contractors, in-house maintenance teams and equipment builders who want a repeatable pack rather than a one-off conversion. Enquiries usually come from one of two places: a machine whose lead-acid set is due for replacement and whose owner wants longer service between replacements, or a new-build scrubber where the battery compartment is still being drawn.

Treat a conversion as a review rather than a swap. The pack matches the voltage class of the old set, but the controller's accepted voltage window, the charger profile, the terminal layout and the way the pack is retained all have to line up. We check those against the machine before quoting, which is why the sections below start with the duty cycle and the charger rather than the catalogue number.

In service the pack is charged between shifts, run through brush, vacuum and traction loads, and lifted out only for maintenance. Nothing about it should be a surprise on installation day: what you approve on the drawing is what arrives.

Enclosure & Build

• Steel case, matte black finish. The housing is sheet steel rather than moulded plastic, so it shrugs off dropped tools, the edge of a battery tray and the constant vibration of a scrub deck working over tile or concrete.
• IP65 protection. Dust-tight and protected against water jets, which is the exposure a scrubber battery meets in a wash-down bay. It is not a diving rating: keep direct high-pressure spray off the terminal area and follow the installation instructions for spray direction and duration.
• Recessed lifting handles. Two metal handles sit flush in the case, so two technicians can lift the pack into the tray without slings. Flush handles also mean they add nothing to the footprint you have to clear.
• Side terminal posts. Terminals mounted on the side keep the cable run low and short inside the compartment. Lug size, stud thread and torque figures come from the drawing for the quoted build.
• Rating and warning labels on the unit. Voltage, capacity and handling notes are printed on the pack, so the technician charging the machine reads them where they are needed instead of looking up a file.
• Branding and OEM labelling. The front panel carries our branding as standard. Floor scrubber battery OEM customers usually confirm label artwork, warning text and terminal orientation on the drawing before the build starts.
• Weight configured per build. No counterweight is fitted as standard and the delivered mass is confirmed for each build, because how a scrubber's weight sits in the tray can affect brush pressure and traction.

Electrical Performance & Protection

Current ratings for this pack are given in C terms: 0.5C continuous for both charge and discharge, 1C maximum. On this capacity, 0.5C works out to roughly 67.5A continuous, and 1C to roughly 135A for short peaks — which is where startup inrush, brush engagement and ramp starts land on a scrubber.

Treat the maximum as a peak figure, not a working rate. Ask us for the duration, frequency and temperature conditions attached to the 1C rating for the quoted build before you plan around it. A machine that sits near the maximum for most of a shift is telling you the pack is undersized for the job, whatever the label says.

The pack carries protection against over-current, under-voltage and external short circuit, and the threshold table for a given build is available for review. Trip points and recovery behaviour matter in practice: a machine that has to be power-cycled on the floor after a nuisance cut-out costs more in lost cleaning time than the pack saved.

Cycle life is listed at 4,000 cycles or more. That number depends on how the pack is cycled — charge and discharge rate, ambient temperature, depth of discharge and the capacity-retention criterion used to call a cycle finished. At one full cycle per working day, 4,000 cycles covers well over a decade of working days, but it is a laboratory result, not a statement about calendar life in your building. Ask for the test conditions behind it.

Temperature belongs in the same conversation. Charging has its own window that starts above freezing, while discharging continues to a much lower limit. A pack that has spent the night in a cold store or an unheated loading bay needs to be back inside the charging range before it goes on charge, and the full figures are in the specification table below.

Duty Cycle Profiling

1. Start with the machine, not the battery. Note the scrubber make, model and the voltage window its controller will accept, including the low-voltage cut-off. A 24V battery for automatic floor scrubbers has to sit inside that window at both ends, not just at nominal voltage.
2. Log the current draw in each mode. Take a steady reading in scrub-only, scrub-and-vacuum and transport modes, rather than one averaged figure taken while the machine was doing a bit of everything.
3. Record the peaks separately. Startup inrush, brush engagement, squeegee lift and ramp starts each produce a short spike. Note how long each lasts and how often it repeats — peaks size the protection settings, steady draw sizes the runtime.
4. Measure the simultaneous case. Most machines run brush and vacuum together for the bulk of a shift, so the combined figure is the one that matters, not three separate single-motor tests added together afterwards.
5. Describe the shift. Floor area covered, hours per shift, number of passes, floor type, and how much of the time the machine is actually scrubbing rather than moving between areas.
6. Map the charging windows. When the machine is free to charge, for how long, and what supply is available where it stands.
7. Send the profile with the enquiry. We compare it against the continuous rating and the protection thresholds, and tell you whether the 135Ah build fits or whether the duty cycle supports a larger pack.

Brush, Vacuum & Traction Loads

• The brush motor is the torque-heavy load. It draws hardest when the brush engages and when down-pressure rises on a rough, coated or unsealed floor. On a smooth sealed surface the same machine draws noticeably less, which is why two sites with identical machines can report different runtimes.
• The vacuum motor sets the baseline. It runs for most of the shift at a fairly constant draw, so it dominates the runtime calculation. A full recovery tank, a damp filter or a worn squeegee raises that baseline quietly — a machine that used to finish its round with margin starts cutting out after a filter change is overdue.
• Traction draws in bursts. Pull-away, ramps, thresholds and a loaded solution tank all push the current above the cruising figure for a second or two. Those bursts are exactly what a maximum rating exists for, and exactly what a marginal pack cannot absorb.
• The combined case is the real one. Brush, vacuum and traction can all be live at the start of a pass. Measure that overlap rather than adding three separate readings, because the pack and its protection see the sum.
• Load changes as the machine wears. Brushes that no longer sit flat, a stretched squeegee or a partially blocked hose all shift current draw. A runtime complaint is often a maintenance finding, not a battery fault.
• Send the numbers and we will name the driver. With machine model and measured figures we can say whether the brush, the vacuum or the traction burst is setting the size — and whether the 135Ah build is the right answer for that machine.

Charging Window & Charger Match

The charger is part of the battery system, and it is where most conversions come unstuck. A lead-acid charger runs a multi-stage profile built for a flooded or AGM set; its finishing stages and its definition of a full charge are not automatically right for a lithium pack.

Start with what you already own: charger make and model, output voltage and current, charge curve, and the connector it uses. We check those against the charging limits of the quoted build and tell you whether the existing unit can be kept, re-profiled or replaced. Get that answer before the pack is installed, because a charger that never terminates cleanly will shorten the life of whatever it is connected to.

Charging a 24V 135Ah LiFePO4 battery pack is also a scheduling problem. Look at the gaps in the machine's day — an overnight charge, a break in the middle of the shift, a changeover between operators. Partial charging between rounds suits this chemistry, so the practical question is whether the available window and the charger output refill enough energy for the next block of work.

Temperature belongs in the same conversation. The pack has a defined charging window that starts above freezing, so a machine brought in from a cold store or left in an unheated yard needs to be within that range before the connector goes on.

Finally, look at where the charger lives. Cable length, connector wear, a single-phase outlet near the cleaning cupboard and keeping the charger off a wet floor decide whether the routine is actually followed at seven in the morning, when the shift is changing over and nobody has time to hunt for an extension lead.

Fitting & Installation

1. Check the tray against the drawing. Length, width and height all matter, and the terminal posts and cable bends need clearance above and around the case, not just room for the box. A 24V battery for automatic floor scrubbers can match on voltage and still fail on the last 20 mm.
2. Plan the lift. The case has recessed handles at each end, and two people plus a clear route to the tray are worth arranging before the machine is stripped down.
3. Account for the weight change. If brush pressure or traction was tuned around the ballast of the old lead-acid set, decide before the first run whether that difference has to be made up in the tray.
4. Set the terminals and polarity. Match lug size to the terminal posts, keep the spanner clear of the case while tightening, and check polarity twice before connecting. Torque values come from the drawing for the quoted build.
5. Route the cables clear. Keep them away from linkages, the squeegee mechanism and anywhere water collects, and secure them so months of vibration cannot rub through insulation.
6. Settle the interface questions early. If the controller expects a signal, an interlock or a communication line from the battery, that has to be agreed for the quoted configuration before the pack is built.
7. Commission in stages. Check open-circuit voltage at the terminals, connect, bring the machine up, watch for fault codes, then run a short scrub pass and check terminal temperature before handing the machine back to the operator.

Specifications

Sample Acceptance

1. Check the unit against the drawing. Revision, dimensions, mass, terminal layout and polarity — before it goes anywhere near the machine.
2. Bench-test first. Open-circuit voltage, charge acceptance with your own charger, and the termination behaviour you expect. A pack that will not terminate on your charger will not improve once it is bolted into a tray.
3. Fit the 24V 135Ah LiFePO4 battery pack into the real compartment. Connect the cables, close the machine's covers and confirm nothing fouls the terminals or traps a cable.
4. Run representative shifts in each mode. Record runtime, recharge time, fault codes and case temperature rather than a single overall impression at the end of the week.
5. Inspect after the first long run. Terminals, lugs and insulation are where installation problems show up first, long before the cells do.
6. Agree what counts as acceptance, in writing, before volume is discussed. Name the runtime and turnaround figures you expect from the machine, so the decision rests on a measurement instead of an opinion.
7. Keep the datasheet revision with the machine record. Later orders then match the unit that was actually accepted, not a remembered version of it.

Documents & Test Reports

Configuration Review & Ordering

• Machine details. Make, model, controller voltage window and low-voltage cut-off.
• Load profile. Steady and peak current per mode, with peak duration and frequency.
• Shift and charging pattern. Hours per shift, area covered, and the windows when the machine can be charged.
• Installation information. Compartment dimensions, fixing points, cable route and the connector you need.
• Destination market. It decides which reports, declarations and transport documents are relevant to your order.
• Document scope. Ask which configuration each test report covers before you rely on it; a report issued for another build does not transfer to yours.
• Branding. Floor scrubber battery OEM orders usually confirm front-panel label artwork, warning text and terminal orientation on the drawing before the build starts.
• Commercial terms. Order quantity, lead time, packing for lithium transport, warranty and service arrangements, plus sample availability and terms — ask your sales contact for current figures rather than assuming them.
• Related items. The same factory supplies 12.8V SLA replacement packs and 16S and 4S BMS boards, so a site running mixed equipment can cover several batteries in one enquiry.

Procurement Questions

Will FB03 replace the existing lead-acid battery?

Review the specific machine first. Electrical limits, charger settings, tray fit, mass, fixing, connections and any communication or safety interlock need to be approved together. Do not select it solely by system voltage or an assumed drop-in fit.

Does the battery guarantee a full cleaning shift?

No runtime is established by capacity alone. Provide actual current demand, machine settings, shift length, temperature and charging opportunities, then validate the target duty cycle with a representative sample.

Does a lithium retrofit remove all maintenance?

Do not use a generic maintenance-free claim as the service plan. Follow the instructions for the approved pack and machine, including checks on connectors, wiring, mounting and environmental exposure. Agree maintenance and after-sales responsibilities in the quotation.

Technical Support & Model Matching

Technical questions reach the people who build the packs. Our engineering group in Shenzhen reviews your device's voltage window, load profile, enclosure space and charger before proposing a configuration; our sample group then builds units so you can validate fit and runtime before production. Cell selection, BMS design and pack assembly stay in-house, with quality checks in process and at final inspection, and a documentation team handling certificates, test reports and shipping papers. When a unit behaves unexpectedly in the field, our engineers help trace the fault and advise on installation and commissioning.

FAQ