No dependable yes-or-no answer exists without two records: your measured duty cycle and the rated datasheet for the exact pack quoted. A chemistry label, a model name, or a verbal assurance cannot establish multi-shift capability. What a buyer can do now is gather the inputs that make the decision testable — how much energy the trucks actually use per shift, when and for how long they can charge, and the rated capacity, charge, and discharge figures of the candidate pack. This article explains the decision mechanism and the checks to run; it contains no verified GOTION JTM product figures, so nothing here should be read as a specification.
Why the Duty Cycle Comes First
Two pallet trucks of the same model can have very different energy demands depending on the site. Industry commentary on material handling notes that equipment utilization can reach roughly 18 work hours per day with short breaks in multi-shift operations — a level at which the battery plan, not the truck, often becomes the limiting factor. Before comparing packs, document:
- Shift structure: single, double, or triple shifts, and hours per day
- Load weights and how much of the time is spent lifting versus traveling
- Floor condition, ramps, and travel distances, which drive current draw
- Length and timing of operator breaks, and whether the truck can sit on a charger during them
- Seasonal peaks that push usage above the daily average
Size for the demanding periods rather than an average. Averaging a light week with a heavy one hides the shortfall.
What to Request on the Pack Datasheet
Accept only figures printed in a rated datasheet for the exact pack quoted; estimates given in conversation remain estimates until confirmed in writing.
- Nominal voltage and confirmation of compatibility with the truck's electrical system
- Rated capacity, together with the discharge rate at which that rating applies. For orientation only: published industry commentary places lithium power packs for off-highway industrial vehicles commonly in the 100–1000 Ah range, expandable by series or parallel arrangements — this describes the market, not any specific pack
- Rated continuous and peak discharge currents against the truck's draw
- Recommended charge rate and the charge window it implies for your break structure. The same commentary describes 0.5–1.0 C as a normal charging-rate range for LFP cells; use it only to sanity-check whether a quoted pack's figure is plausible, never as a substitute for the pack's own rating
- Operating and charging temperature ranges, including any low-temperature charging restriction. Charger configuration guidance from an equipment manufacturer illustrates the general principle: charging lithium iron phosphate batteries below a defined temperature threshold can damage them, so charger-side low-temperature cut-off settings exist for batteries that cannot block charging themselves. The exact threshold and how it is enforced must come from your pack's documentation, not assumed
- Mass, dimensions, and mounting; in some counterbalanced truck designs the battery contributes to machine stability, so a mass change may need an engineering review rather than a dimensional check alone
- Battery management functions and how the pack communicates with truck or charger, including how repeated partial charging is handled
Cycle-life figures deserve particular scrutiny. Published comparisons credit lithium batteries with roughly three to four times the cycle life of lead-acid types, but that is a market-level generalization. A pack-specific cycle count is meaningful only alongside its rating conditions — stated depth of discharge, a reference temperature, and defined charge and discharge rates. If those conditions are absent from the datasheet, say so plainly rather than assuming the figure favors you.
The Multi-Shift Decision Mechanism
Whether one pack serves multiple shifts depends on an energy balance computed for your site:
- Energy removed: what each shift actually consumes, which only measurement establishes
- Energy restored: what the rated charge current and the available break time can return mid-day
- Reserve: capacity held back for peaks, cold days, and end-of-shift surges
The test can be stated without product numbers. If each shift removes an amount of energy S, the day holds two shifts, and total break time can return an amount R at the pack's rated charge rate, one-pack operation is plausible on paper only when usable capacity U plus R is at least two shifts' worth of S plus a reserve margin. To see the arithmetic in a purely hypothetical illustration: with numbers chosen only for the math, if U were 10 units, R 3 units, and S 6 units, then U + R = 13 against 12 plus reserve — marginal, and likely insufficient once aging and peaks are counted. Change any one input and the answer flips, which is why measured S and rated U and R must replace guesses. Every term comes from either a rated datasheet figure (U, the rate behind R) or your own measurement (S and the break log).
Charging during breaks — often called opportunity charging — only works for you if the pack, charger, and battery management system are rated for repeated partial cycles across the day. That is a question the datasheet and the supplier's written application notes must answer. A related planning point from the same industry commentary: lead-acid charging loses a substantial share of input energy as heat (around 30 percent is cited), whereas lithium charges more efficiently — relevant if you are comparing chemistries, though your own energy bills and the pack documentation settle it. If a proposed pack is an application design still in development rather than a validated product, treat the multi-shift claim as unproven.
Qualitative Tradeoffs to Weigh
- Larger capacity: more runtime and reserve, but higher cost, added mass, and potential fit or stability consequences.
- Faster charging: shorter breaks recover more energy, but requires a charger and site supply suited to it, and charging above the manufacturer's rated rate is never a buyer-side decision.
- Two smaller packs in rotation: can decouple runtime from charging windows, but adds handling, storage, and equipment costs. Lead-acid fleets historically used this swap model because a single battery could not cover the day; whether lithium removes that need at your site depends on the balance above, not on chemistry alone.
Three Useful Questions to Ask
- What are the rated capacity, discharge, and charge figures of the exact pack quoted, and at what conditions were those ratings established?
- Is the pack rated for repeated partial charging during short breaks, and how does its battery management handle that pattern?
- What documentation exists for validation with our truck model, and can it be shared for review?
Can amp-hours and voltage give a first runtime estimate?
They can structure an estimate, but real consumption depends on loads, floors, lifting duty, and temperature. Until consumption is measured on your own trucks, every calculated runtime stays an estimate.
Is one pack or two the standard approach?
Neither is universal. The choice follows break structure, charging locations, mass limits, and handling practicalities at your site.
Do we still need a dedicated charging area?
Charging arrangements depend on the equipment, chemistry, and facility, and require review by qualified parties. This article does not provide electrical installation guidance.
Checklist Before Deciding
- Rated datasheet for the exact pack quoted, with rating conditions stated
- Measured or logged energy use per shift for your trucks and loads
- Break schedule and available charging windows
- Written confirmation that partial-cycle charging is within the pack's rating
- Mechanical and mass review if the replacement differs from the original battery
- Confirmation the pack is a released, validated product, not a design
- Cycle-life data tied to conditions comparable to your duty
With these records assembled, a qualified engineering team — yours or an integrator's — can perform a technical fit review comparing rated capacity, charge characteristics, and mechanical fit against measured duty. Until that review is completed, any multi-shift runtime conclusion remains provisional.