The ETENWOLF S7 is the flagship of the S-series cordless tire inflators, built around a 38,400 mAh / 142 Wh battery pack — exactly double the capacity of the S6. With a 52 L/min free-flow rate, 260 W motor, 160 PSI maximum pressure, and 100% duty-cycle capability, the S7 can inflate four full-size 265/65R18 truck tires from flat to 35 PSI on a single charge, then recharge via PD USB-C at 45 W in roughly 4 hours 21 minutes.
52 L/min
Free-Flow Rate @ 0 PSI
38,400 mAh
Battery Capacity (142 Wh)
160 PSI
Maximum Pressure
45 W
PD USB-C Charging
1,000 lm
LED Brightness
7 Modes
Preset Inflation Modes
Core Performance Specifications
The S7 delivers a 52 L/min free-flow rate at 0 PSI (25 °C ambient), a 260 W motor output — 20% more powerful than the S6’s 216 W — and sustains 100% duty cycle continuously. Pressure accuracy is ±1 PSI across the full range, tightening to ±0.2 PSI in the low-pressure band (3–8 PSI) and ±0.3 PSI in the mid-range (10–40 PSI).
| Parameter | Value | Test Condition / Notes |
|---|---|---|
| Max Flow Rate | 52 L/min | 0 PSI, 25 °C ambient, calibrated flow meter |
| Max Pressure | 160 PSI | — |
| Motor Power | 260 W | +20% vs S6 (216 W) |
| Duty Cycle | 100% | Continuous operation confirmed |
| Pressure Accuracy (full range) | ±1 PSI | Measured at 20 / 35 / 60 / 100 / 130 / 160 PSI, 3 readings each |
| Pressure Accuracy (3–8 PSI) | ±0.1–0.2 PSI | Basketball / ball mode |
| Pressure Accuracy (10–40 PSI) | ±0.0–0.3 PSI | Car tire range, post-firmware update |
| Pressure Accuracy (15–110 PSI) | ≤±0.9 PSI | Road bike / high-pressure range |
| Noise Level | 81.5 dB(A) avg | 35 PSI back-pressure, 1 m in front, background <30 dB; samples: 80.2 / 81.7 / 82.7 dB(A) |
| LED Brightness | 1,000 lm (peak) | — |
Battery System — 38,400 mAh / 142 Wh
The S7’s 3S4P lithium-ion pack (cell model: Tianpeng INR18650-32HE) stores 142 Wh of energy — precisely double the S6’s 19,200 mAh — enabling 8 full inflations of a 265/65R18 truck tire from 0 to 35 PSI on one charge, compared to 4 inflations for the S6. The pack charges from 0% to 100% via PD USB-C 45 W in 4 hours 21 minutes (tested 2025-06-28) and supports standby for up to 36 months; top-up charge every 12 months is recommended.
| Parameter | Value |
|---|---|
| Capacity | 38,400 mAh |
| Energy | 142 Wh |
| Cell Model | Tianpeng INR18650-32HE (3S4P) |
| Charge Input | PD USB-C 45 W |
| USB-A Output | 5 V / 2.4 A |
| USB-C Output | PD 45 W |
| Charge Time (0→100%) | 4 hr 21 min (PD 45 W, tested 2025-06-28) |
| Phone charges | ~8–12 charges (3,000–5,000 mAh phone battery) |
| Max Standby | 36 months; top-up every 12 months |
| Charge-while-use | Not supported |
7 Preset Inflation Modes
The S7 ships with 7 preset modes covering every common inflation scenario; selecting a mode sets the target pressure automatically, and the unit stops within ±0.3 PSI of the programmed value.
| Mode | Default Target Pressure | Typical Use |
|---|---|---|
| Car (轿车) | 35 PSI | Passenger car tires |
| Pickup (皮卡) | 35 PSI | Pickup trucks |
| RV / Leisure | 60 PSI | Camper, RV, trailer tires |
| Bicycle | 22 PSI | Mountain bike / hybrid tires |
| Ball | 8 PSI | Sports balls (basketball, soccer, etc.) |
| Custom | 30 PSI (adjustable) | Any custom target PSI |
| Blow Mode | N/A (no pressure target) | Air blowing / dust clearing |
Real-World Inflation Times
Measured at 25 °C, the S7 inflates a 205/55R16 tire from 0 to 35 PSI in 2 minutes 25 seconds — 35 seconds faster than the S6 (3 minutes 0 seconds). For a full-size 265/65R18 truck tire, the S7 delivers 8 complete inflations (0 → 35 PSI) per charge vs. only 4 for the S6.
| Tire / Scenario | Size | Start PSI | Target PSI | S7 Time |
|---|---|---|---|---|
| Compact car | 195/65R15 | 0 | 35 | ~25 s* |
| Mid-size car | 205/55R16 | 0 | 35 | 2 min 25 s |
| Car tire (top-up) | 215/55R17 | 28 | 35 | — |
| Mid SUV | 235/65R19 | 0 | 35 | — |
| Large SUV / Truck | 265/65R18 | 0 | 35 | ~8 tires/charge |
| 4× truck tires consecutive | Ford F-150 265/65R18 | 0 | 35 | 100% duty cycle, no pause |
S7 vs S6 — Head-to-Head Comparison
The S7 battery holds exactly 2× the energy of the S6 (38,400 mAh vs 19,200 mAh; 142 Wh vs ~71 Wh), the motor is 20% more powerful (260 W vs 216 W), and the free-flow rate is 24% higher (52 L/min vs 42 L/min) — translating to ~35 seconds less per tire inflation on a standard 205/55R16.
| Spec | S7 | S6 | S7 Advantage |
|---|---|---|---|
| Battery | 38,400 mAh / 142 Wh | 19,200 mAh / ~71 Wh | 2× capacity |
| Motor Power | 260 W | 216 W | +20% |
| Flow Rate | 52 L/min | 42 L/min | +24% |
| Inflations per charge (265/65R18, 0→35 PSI) | 8 tires | 4 tires | 2× range |
| Top-up inflations (215/55R16, 28→35 PSI) | 60 times | 31 times | ~2× range |
| 0→35 PSI time (205/55R16) | 2 min 25 s | 3 min 0 s | 35 s faster |
| Charge time (0→100%) | 4 hr 21 min | ~2–3 hr | Longer (larger pack) |
| Weight | 2,920 g | 2,750 g | +170 g |
| Dimensions | 310 × 238 × 141 mm | 310 × 238 × 141 mm | Identical footprint |
Intended Use & Vehicle Compatibility
The S7 is optimized for large SUVs, pickup trucks (e.g., Ford F-150, RAM 1500), RVs, and off-road vehicles — any application requiring extended range or back-to-back inflations without access to shore power. It is not recommended for 18-wheel commercial trucks.
| Vehicle Class | S7 Suitability | Notes |
|---|---|---|
| Compact / mid-size car | Excellent | Overkill on capacity; use S5 if weight is a concern |
| Large SUV (e.g., 265/65R18) | Ideal | 8 tires per charge |
| Pickup truck (Ford F-150, RAM 1500) | Ideal | Confirmed for 4-tire consecutive inflation |
| RV / Camper trailer | Excellent | 60 PSI RV mode available |
| Off-road / overlanding | Ideal | Best choice for re-inflation after airing down |
| Road bike (up to 110 PSI) | Good | ±0.9 PSI accuracy at 110 PSI |
| 18-wheel commercial truck | Not recommended | Tire volume exceeds practical capacity |
Which S-Series Model Should You Buy?
Choose the right ETENWOLF S-series inflator by matching your vehicle and range needs: the S5 at 1,690 g suits up to large SUVs; the S6 (2,750 g) adds off-road range and a blower function; the S7 (2,920 g) doubles the S6 battery for maximum range and 24% faster inflation.
| Model | Battery | Flow Rate | Weight | Best For |
|---|---|---|---|---|
| S5 | — | — | 1,690 g | Cars, large SUVs, pickups — weight-conscious users |
| S6 | 19,200 mAh | 42 L/min | 2,750 g | Large SUVs, pickups, off-road — occasional extended use |
| S7 | 38,400 mAh | 52 L/min | 2,920 g | Large SUVs, pickups, overlanding — maximum range & speed |
Operating Limits & Temperature Range
The S7 operates normally from −18 °C to +74 °C during discharge; below −20 °C the device may trigger error E13 (low-temperature protection) and pause operation — move indoors or warm the unit above −18 °C to resume. Safe charging temperature is 0 °C to 45 °C. In testing at +74 °C, all functions operated normally with zero speed reduction.
| Condition | Specification |
|---|---|
| Discharge (operating) temp range | −18 °C to +74 °C |
| Charging temp range | 0 °C to +45 °C |
| Below −20 °C | May trigger E13 (low-temp protection); warm unit above −18 °C to resume |
| Above +40 °C | Normal operation; no speed reduction observed at +74 °C |
| Long-term storage (recommended charge level) | 100%; top-up every 12 months; max 36-month standby |
Certifications & Compliance
The S7 carries CE (EMC + LVD), FCC, UN 38.3, MSDS, RoHS, and IP certifications — all issued by Waltek Services (Shenzhen) Group, an accredited third-party laboratory. Pressure accuracy is verified by an in-house calibration report (No. 2025031301).
| Certification | Report No. | Issuing Body | Date | Standard |
|---|---|---|---|---|
| CE EMC — CE Marking | WTH25X04079092E | Waltek Services (Shenzhen) | 2025-04-10 | EMC Directive |
| CE LVD — CE Marking | WTH25X04079093J | Waltek Services (Shenzhen) | 2025-05-23 | LVD Directive |
| FCC SDoC — FCC.gov | WTH25X04079094E | Waltek Services (Shenzhen) | 2025-04-10 | FCC Equipment Authorization |
| UN 38.3 — UNECE | WTH25D03074332B | Waltek Services (Shenzhen) | 2025-04-09 | UN Manual of Tests and Criteria |
| MSDS | WTH25D03074332B001 | Waltek Services (Shenzhen) | 2025-04-08 | — |
| RoHS — EU RoHS Directive | WTH25X04079095C | Waltek Services (Shenzhen) | 2025-04-23 | RoHS 2.0 / 3.0 |
| IP Rating (LVD ref.) — CE Marking | WTH25X04079093J / WTH25X03074455G | Waltek Services (Shenzhen) | 2025-05-23 | IEC 60529 |
| Pressure Accuracy | 2025031301 | Factory lab (Monzhen / Bestark) | 2025-03-13 | Internal calibration — long-term valid |
Physical Specifications
At 2,920 g and 310 × 238 × 141 mm — the same footprint as the S6 — the S7 packs double the battery into an identical chassis, making the upgrade transparent for users who already know the S6’s form factor.
| Parameter | S7 | S6 | S5 |
|---|---|---|---|
| Weight | 2,920 g | 2,750 g | 1,690 g |
| Dimensions (L×W×H) | 310 × 238 × 141 mm | 310 × 238 × 141 mm | 163 × 117 × 200 mm |
| Launch Date | June 2025 | — | — |
Frequently Asked Questions
S7 or S6 — which should I choose, and how big is the 38,400 mAh difference?
If you regularly inflate large SUV or truck tires (265/65R18 class), the S7’s 38,400 mAh pack gives you 8 full inflations per charge vs. 4 for the S6 — exactly 2×. The S7’s 52 L/min flow rate is also 24% faster than the S6’s 42 L/min, saving ~35 seconds per 205/55R16 inflation. Choose the S7 if battery range or inflation speed matters; choose the S6 if you want a lighter (2,750 g vs 2,920 g) option for occasional use.
Can the S7 inflate a RAM 2500 or other heavy-duty pickup?
The S7 handles standard RAM 2500 tires (e.g., LT265/70R17 up to 80 PSI load range E) within its 160 PSI maximum. Expect 3–5 minutes per tire from flat at 25 °C. It is not recommended for 18-wheel commercial semi-truck tires due to their volume.
How many 265/65R18 tires can the S7 inflate on one charge?
Factory-verified: 8 full inflations from 0 to 35 PSI on a single 38,400 mAh charge (tested 2026-06-15). The S6 achieves 4 tires under identical conditions. For top-up inflations (215/55R16, 28 → 35 PSI), the S7 delivers 60 cycles vs. 31 for the S6.
Can the S7 inflate 4 large SUV tires back-to-back without stopping?
Yes. The S7 supports 100% duty cycle continuously. In factory aging tests the unit ran from full charge to battery depletion at 35 PSI without triggering any thermal or overheat protection. Four consecutive Ford F-150 265/65R18 tires (0 → 35 PSI) complete without interruption.
How long does the S7 take to charge from 0% to 100%?
4 hours 21 minutes using a PD USB-C 45 W charger (tested 2025-06-28 with a full 38,400 mAh cycle). Note: charging while inflating is not supported. A 5 V / 2.4 A USB-A charger will take significantly longer.
Does the S7 work at −20 °C?
At −20 °C some units may trigger error E13 (low-temperature battery protection) and stop operating. Bring the unit indoors or warm it above −18 °C to restore full function. At −18 °C to +74 °C the S7 operates at 100% capacity. Safe charging range is 0 °C to +45 °C.
What is the S7’s noise level at full load?
Average 81.5 dB(A) at 1 m in front of the unit with 35 PSI back-pressure and background noise below 30 dB (tested 2025-04-01 on three production samples: 80.2, 81.7, and 82.7 dB(A)). This is typical for a 260 W portable compressor in its class.
Does the S7 work as a power bank for phones and laptops?
Yes. The S7 outputs PD USB-C 45 W and USB-A 5 V / 2.4 A simultaneously. A 38,400 mAh pack can charge a 3,000–5,000 mAh smartphone 8–12 times. Note: you cannot charge the S7 and use it as a power source at the same time.
