PRACTICAL MAINTENANCE GUIDE

Floor Scrubber Battery Runtime Dropping? What to Record First

Shorter runtime is an observation, not a battery diagnosis. Compare like-for-like cleaning work and record the charger’s actual completion or fault indication before deciding that the battery has failed.

Compare the same work, not just the clock

According to Tennant’s battery-performance explanation, machine configuration, operating settings and travel speed affect runtime. Published runtime describes particular conditions and is not a guarantee for every cleaning route.

Build a baseline from ordinary, safe operation on a repeatable route. Record active cleaning time separately from elapsed shift time. If a machine is parked for a meeting or moved between buildings, those minutes should not silently become “scrubbing runtime.” Keep your measurement definition consistent across entries.

Also record what ended the work: a normal scheduled finish, a low-battery indication, a service fault or an operator decision. A shift that stops early because the building closes does not measure the battery’s available runtime. Never deliberately run the battery past the machine’s prescribed discharge limit to complete a comparison.

Identify the installed battery before applying advice

Tennant’s battery-options guide distinguishes flooded lead-acid, sealed AGM, GEL and lithium-ion batteries. Their maintenance and charging requirements differ; sealed AGM and GEL do not need watering. Use the installed battery and charger instructions, not a generic schedule intended for another chemistry.

Capture accessible identification labels without opening electrical enclosures. If the label is hidden or unreadable, ask the service provider to identify the configuration. Include the charger model and any recent battery or charger replacement. Do not change a charging profile, open sealed batteries or substitute a charger based on an online guess.

Keep a short, comparable shift log

Date and operator: ___
Machine model/serial: ___
Battery and charger identification: ___
Charging start/end and displayed completion or fault: ___
Route/floor area: ___
Cleaning start/end: ___
Breaks and transport time: ___
Brush/pad and permitted pressure setting: ___
Reason cleaning stopped: ___
Exact warning and when it appeared: ___

Leave unknown fields blank rather than filling them from memory. A phone photo of the display can preserve an exact indication, provided it is taken safely and does not include unrelated private information. Keep previous entries when a setting changes so the change remains visible.

How to read the log without overdiagnosing

Different route or settings: the two shifts are not directly comparable. Mark that limitation before calculating a runtime change.
No recorded charging completion: investigate the charging history with service; a long plugged-in period alone is not your evidence that charging completed.
Repeated decline on comparable work: provide the records for testing. The pattern strengthens the report but does not identify which component is responsible.
A charger fault or machine fault: preserve the exact display and use the correct equipment’s fault reference. Do not merge two different displays into one code.

Ask for a diagnosis before a replacement quote

Send the log, identification details and the date the change first appeared. Ask the technician what tests are needed to distinguish charging, battery and machine-load issues. If replacement is proposed, request confirmation of approved battery type, capacity, physical fit and charger compatibility for the machine.

Illustrative comparison: a previous shift included 90 minutes of cleaning and a 30-minute break; a later shift included 90 minutes of cleaning without a break. Their elapsed times differ, but the recorded cleaning times do not. This example is bookkeeping guidance, not a performance claim or field test.

Stop using equipment that shows an unsafe condition and follow the site’s response procedure. This checklist does not instruct battery repair, electrical testing or charger reconfiguration. For model-specific displays, consult the manual library; for help organizing an enquiry, use Repair Help.

Sources and editorial scope

Prepared by CleanEquip Pro Editorial · October 24, 2026. Manufacturer references are linked beside the relevant statements. The worksheets and illustrative examples are editorial aids, not field-test results. Follow your equipment and floor manufacturer instructions; only trained operators should perform permitted checks. Qualified service should handle battery, electrical and internal repair work.

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