"Can it run on batteries?" is one of the most frequent questions we hear. The honest answer: yes, we have the technology — production-proven battery designs exist for commercial displays. But for most products, and virtually all consumer products, we do not recommend it. Here are the five engineering reasons, with the math.
1. Voltage matching: a small battery must survive a huge current surge
Our levitation systems run on 12 V. A single lithium cell delivers only 2.8–4.2 V, so a battery design needs a DC-DC boost converter. The problem is the system's power profile: tiny most of the time, extreme in an instant.
- Steady levitation draws only 1.5–2.5 W.
- But catching and locking the floater — every power-up, every disturbance — demands a peak of 12 V × 3 A = 36 W.
Run that through a boost converter at η ≈ 85% and look at what the battery sees:
- Peak battery power: Pbat = 36 W ÷ 0.85 ≈ 42 W
- Worst case, nearly empty at 2.8 V: I = 42 ÷ 2.8 ≈ 15 A
- Even fully charged at 4.2 V: I ≈ 10 A
So a cell that idles at 0.5 A must be ready to deliver 10–15 A (40 W+) at any moment. With a normal 1.3× design margin, the pack, protection board and wiring must be specified for roughly 20 A / 50 W. For a common 18650 cell (2500 mAh), 15 A is a 6 C discharge rate — that forces power-type cells at 2–3× the cost of capacity-type cells, plus a heavier BMS, fusing and safety certification. The power section alone multiplies in cost.
Runtime is equally unforgiving: at a 2 W average the battery side draws ≈2.4 W, so one 18650 (≈9.6 Wh) lasts about 4 hours. A full working day needs 2–3 cells — more size, more weight, more cost.
2. A dead battery means a falling floater — the red line
When the battery runs out, levitation ends instantly. What happens next depends on the system type, and neither answer is good:
PU systems (push-up): the floater drops onto the base. The impact energy is E = m·g·h — a 0.5 kg floater falling 30 mm carries ≈0.15 J onto a small contact area. If the housing absorbs that over just 1 mm of deformation, the average impact force is F ≈ E/δ ≈ 150 N. On larger systems (PU100G and above) the floater is far heavier, and a single hard slam can crack the housing or knock internal components out of position — after which the system may never balance again. That is irreversible damage, and it is our red line.
PD systems (pull-down): the floater snaps upward into the drive core. Magnetic attraction rises steeply as the gap closes (roughly F ∝ 1/d² near contact), so the floater doesn't just fall — it accelerates into the core harder than gravity alone. The housing takes the full hit, and in unstable edge cases the floater can also break free and fall onto the displayed product.
3. Impact noise: the consumer-experience killer
The moment a floater drops or snaps up, it lands with a loud "clack" — this is dictated by physical structure and cannot be tuned away in software. In daylight it startles; at 3 a.m. it wakes the household. Across the battery-powered products we have shipped, this is one of the most common complaints we receive. For a home product, this point alone is disqualifying.
Commercial practice is different: a battery-powered commercial display must integrate a low-voltage buzzer alarm, so staff can remove the floater and recharge in time. Miss the alarm window and the magnet still falls — at best it chips the base coating, at worst it cracks the base structure and damages your merchandise in the same incident.
4. Battery aging: every risk above grows with time
Lithium cells fade by chemistry, exactly like your phone. A consumer cell typically retains 80% capacity after 300–500 full cycles; with daily charging, most packs sit at 60–80% after one year. Runtime shrinks from 4 hours toward 3, and the low-battery drop events of sections 2 and 3 happen more and more often the longer the product is used. The product doesn't just age — it gets riskier.
5. Shipping: batteries travel as dangerous goods
A product with a sizable lithium battery is Class 9 dangerous goods: UN38.3 testing and an MSDS are mandatory, air freight must follow PI966/967 rules with state of charge ≤30%, and only DG-capable channels will carry it. Freight typically rises 30–50%, and some routes simply refuse the cargo. The per-unit logistics cost climbs noticeably before the product even reaches your customer.
What we recommend
| Scenario | Recommendation |
|---|---|
| Home / consumer products | No battery. Plug into mains — levitation draws only 1.5–2.5 W, so the electricity cost is negligible. |
| Commercial displays without power outlets | Battery is workable — we have proven designs — but only with a low-voltage alarm and a staff routine to remove the floater and recharge on time. |
In one line: battery power is a manageable risk for commercial displays — and for home use, we strongly recommend against it.
Frequently asked questions
- Can you build a battery-powered levitation display if I really need one? Yes — we have production-proven battery designs for commercial displays. They always include a low-voltage buzzer alarm so staff can remove the floater and recharge in time. For home and consumer products, we strongly advise against battery power.
- How long would a battery last on a levitation module? Levitation itself draws only 1.5–2.5 W, so a single 18650 cell (≈9.6 Wh) runs roughly 4 hours. The real problem is that the battery must also survive 10–15 A peak currents during catch-and-lock events, which dictates expensive power-type cells and heavy protection circuitry.
- What happens to the floater when the battery dies? It falls. On PU (push-up) systems it slams onto the base — potentially cracking the housing and knocking internal parts out of alignment. On PD (pull-down) systems it snaps upward into the drive core. Either way the impact is loud and can cause permanent damage.
Related reading: Why Does It Spin? Rotation in PU Levitation Systems, Explained and Nothing Touches. Nothing Wears. Nothing Hums. — or see the PU300G levitation module and Global Adapter Guide module selection guide. Planning a commercial battery project? Talk to our engineers.
From Our Inbox: Customer Questions
Q"We’re exhibiting at a 3-day trade show and our booth has no power outlet. Can you do a battery version?" — Mr. T., Germany
AYes — this is exactly the commercial scenario where battery power makes sense. For show duty we size the pack to the day (three 18650 cells cover roughly 12 hours of levitation), integrate the low-voltage buzzer, and brief your staff on the remove-and-recharge routine. We ship these regularly for booth and window displays. — Mr. Wang, Power Electronics Engineer
Q"Could a small backup battery just prevent the drop if the mains fails?" — Ms. R., United Kingdom
ATechnically yes — a UPS-style reserve that holds levitation briefly or manages a safe descent. But the reserve cell still faces the same 10–15 A peak during catch-and-lock, so it cannot be a tiny battery, and the charge-management circuit adds cost. For OEM commercial projects we do offer this; for home products we still recommend plain mains power. — Mr. Wang, Power Electronics Engineer
Q"Can I just run it off a USB power bank?" — Mr. D., United States
AFor a quick demo, a USB-C PD bank that negotiates 12 V / 3 A can work — that matches our 36 W peak directly, no boost converter needed. Expect roughly 3–4 hours from a 20,000 mAh bank, watch out for auto-sleep shutoff at low draw, and remember: when the bank runs empty, the floater still falls. Fine for a presentation; not something we would ship in a product. — Mr. Wang, Power Electronics Engineer