The ETENWOLF HB2 is the mid-range model in the HB series — a low-pressure, high-flow portable electric air pump built for camping sleeping pads, inflatable items, and vacuum storage bags. Delivering 360 L/min at zero back-pressure (the same flow rate as the Air 2/3), the HB2 inflates a 60 × 190 cm camping pad in approximately 18 seconds and provides 47–52 full inflations per charge from its 4,000 mAh / 14.8 Wh battery — 54% more capacity than the Air 2’s 2,600 mAh. At 270 g and with a maximum output pressure of 5.0 kPa (0.73 PSI), it is not compatible with car tires (200+ kPa required), SUP boards (100+ kPa required), or sports balls.
360 L/min
Free-Flow Rate @ 0 kPa
4,000 mAh
Battery (14.8 Wh)
~18 s
Pad Inflation Time (60×190 cm)
47–52 pads
Per Charge (60×190 cm pad)
270 g
Weight
5.0 kPa
Max Output Pressure
Core Performance Specifications
The HB2 moves air at 360 L/min with zero back-pressure (25 °C, calibrated flow meter) — enough to fill a single sleeping pad in ~18 seconds or a 40 × 60 cm vacuum compression bag (with clothes) in ~20 seconds. Its 4,000 mAh / 14.8 Wh battery charges to full in 2–3 hours via PD USB-C 10 W and is rated for up to 36 months standby.
| Parameter | Value | Notes |
|---|---|---|
| Max Flow Rate | 360 L/min | @ 0 kPa, 25 °C, calibrated flow meter |
| Max Output Pressure | 5.0 kPa (0.73 PSI) | Low-pressure pump — not for tires, SUP, or balls |
| Battery Capacity | 4,000 mAh / 14.8 Wh | Airline carry-on: <100 Wh ✓ |
| Charge Input | PD USB-C 10 W | Charge-while-use: not supported |
| Charge Time (0→100%) | 2–3 hr | 10 W PD charger |
| Noise Level | 71.1 dB(A) | @ 1 m, full load |
| Inflate & Deflate | Both supported | Deflate (vacuum) mode for storage bags |
| Weight | 270 g | — |
| Dimensions | 69 × 56 × 105.5 mm | — |
| Colors | Yellow / Black | — |
| Launch Date | August 2025 | — |
| Standby (storage) | Up to 36 months at 100% charge | Top-up every 12 months recommended |
Inflation Times & Capacity per Charge
All measurements were taken at 25 °C with a 100% charged battery. The HB2’s 5.0 kPa maximum pressure is designed for high-volume, low-pressure inflatables; car tires (200+ kPa) and SUP boards (100+ kPa) are not compatible.
| Item | Inflation Time | Per Charge | Notes |
|---|---|---|---|
| Camping pad (60×190 cm) | ~18 s | 47–52 pads | 25 °C, 100% battery |
| Vacuum compression bag (40×60 cm, with clothes) | ~20 s | 40–45 per charge | Deflate mode, 25 °C |
| Adult swim ring (100 cm diameter) | ~57 s | 14–17 per charge | Use Pool Ring Nozzle |
| Car tires | Not compatible | — | Requires 200+ kPa; HB2 max is 5.0 kPa |
| SUP boards | Not compatible | — | Requires 100+ kPa |
3 Included Nozzles — What Each One Does
The HB2 ships with the same 3 nozzle adapters as the HB1; all attach via press & lock onto the pump outlet. Each nozzle is sized for a specific inflation category.
| No. | Nozzle Name | Compatible Items | Attachment |
|---|---|---|---|
| 1 | Vacuum Storage Bag Nozzle | Vacuum compression bags | Press & lock |
| 2 | Air Mattress Nozzle | Large-valve air mattresses | Press & lock |
| 3 | Pool Ring Nozzle | Swim rings and small valves | Press & lock |
HB2 vs Air 2 — Same Flow Rate, Bigger Battery
The HB2 and Air 2 both deliver 360 L/min, but the HB2 carries a 4,000 mAh battery versus the Air 2’s 2,600 mAh — 54% more capacity. This translates to 47–52 pads per charge on the HB2 compared to approximately 48 on the Air 2, plus faster vacuum bag deflation (20 s vs 27 s). The trade-off is size and weight: the HB2 weighs 270 g against the Air 2’s 165 g.
| Spec | HB2 | Air 2 |
|---|---|---|
| Flow Rate | 360 L/min | 360 L/min |
| Battery | 4,000 mAh / 14.8 Wh | 2,600 mAh / 9.62 Wh |
| Cell Type | — | 18650 cylindrical |
| Charge Input | PD USB-C 10 W | PD USB-C 10 W |
| Charge Time | 2–3 hr | ~1.5 hr |
| Noise | 71.1 dB(A) | — |
| Weight | 270 g | 165 g |
| Dimensions | 69×56×105.5 mm | 48×49×92 mm |
| Vacuum bag time | ~20 s | ~27 s |
| Best for | Extended camping / more pads per charge | Budget / lightweight |
HB1 vs HB2 vs HB3 — Series Comparison
The HB2 sits at the centre of the HB range, balancing flow rate, battery capacity, and weight. The HB1 (55 g) is optimised for ultralight travel; the HB3 (425 g) delivers the maximum pads-per-charge at 86–91.
| Spec | HB1 | HB2 | HB3 |
|---|---|---|---|
| Flow Rate | 180 L/min | 360 L/min | 500 L/min |
| Battery | 1,100 mAh / 4.07 Wh | 4,000 mAh / 14.8 Wh | 8,000 mAh / 29.6 Wh |
| Weight | 55 g | 270 g | 425 g |
| Dimensions | 42×33×68 mm | 69×56×105.5 mm | 108×81×67 mm |
| Pad inflation time | ~74 s | ~18 s | ~13 s |
| Pads per charge | 13–17 | 47–52 | 86–91 |
| Vacuum bag time | ~60 s | ~20 s | ~15 s |
| Noise | 69.8 dB(A) | 71.1 dB(A) | 83.2 dB(A) |
| Best for | Ultralight / 1–2 day trips | Balanced / extended | Max range / large inflatables |
Operating Limits
The HB2 activates thermal protection when the internal temperature reaches a protective threshold. It is not waterproof — keep away from rain and submersion. Charging while inflating is not supported; charge fully before use (2–3 hours via 10 W PD USB-C).
| Limit | Value |
|---|---|
| Max output pressure | 5.0 kPa (0.73 PSI) |
| Waterproof rating | None (not waterproof) |
| Charge while inflating | Not supported |
| Long-term storage charge | 100%; top-up every 12 months; max 36-month standby |
Certifications & Compliance
The HB2 carries CE, FCC, UN 38.3, MSDS, and RoHS certifications, all issued by Waltek Services (Shenzhen) in August 2025. The battery capacity of 14.8 Wh is well below the 100 Wh airline carry-on limit.
| Certification | Report No. | Issuing Body | Date |
|---|---|---|---|
| CE — CE Marking | WTH25H07201498E | Waltek Services (Shenzhen) | 2025-08-06 |
| FCC — FCC.gov | WTH25H07201499E | Waltek Services (Shenzhen) | 2025-08-06 |
| UN 38.3 — UNECE | WTH25D07201659B | Waltek Services (Shenzhen) | 2025-08-12 |
| MSDS | WTH25D07201659B001 | Waltek Services (Shenzhen) | 2025-08-12 |
| RoHS — EU RoHS Directive | WTH25X07201672X1C | Waltek Services (Shenzhen) | 2025-08-19 |
Frequently Asked Questions
HB2 vs Air 2 — they have the same flow rate, why choose the HB2?
The HB2 carries a 4,000 mAh battery versus the Air 2’s 2,600 mAh — 54% more capacity in the same flow-rate class. Practically, the HB2 vacuum-deflates a 40 × 60 cm bag in ~20 seconds versus the Air 2’s ~27 seconds, and delivers 47–52 pad inflations per charge. The HB2 is 105 g heavier (270 g vs 165 g), so if weight is the priority, the Air 2 is the leaner option.
How long does it take the HB2 to inflate a single sleeping pad?
Approximately 18 seconds from flat for a 60 × 190 cm camping pad. This measurement was taken at 25 °C with a 100% charged battery.
How many sleeping pads can the HB2 inflate on one charge?
47–52 full inflations of a 60 × 190 cm single sleeping pad per charge (4,000 mAh). Testing was performed at 25 °C with a 100% charged battery, inflating each pad to standard firmness at ~18 seconds per pad.
How many vacuum compression bags can the HB2 process per charge?
40–45 vacuum compression bags (40 × 60 cm, with clothes) per full charge, at approximately 20 seconds each. Testing was performed at 25 °C with a 100% charged battery using the Vacuum Storage Bag Nozzle.
Can the HB2 inflate car tires or SUP boards?
No. The HB2’s maximum output pressure is 5.0 kPa (0.73 PSI). Car tires require 200+ kPa (29+ PSI) — more than 40 times what the HB2 produces. SUP boards require 100+ kPa (14.5+ PSI). For tire inflation, use a dedicated tire inflator. For SUP boards, use a high-pressure pump rated for 100+ kPa.
HB1, HB2, or HB3 — which should I choose?
Choose the HB1 (55 g, 13–17 pads per charge) for 1–2 day ultralight trips. Choose the HB2 (270 g, 47–52 pads per charge) for multi-day balanced use with a good range. Choose the HB3 (425 g, 86–91 pads per charge) for extended multi-day trips or group camping where maximum range and speed (~13 s per pad) are priorities.
Is the HB2 approved for airline carry-on baggage?
Yes. The HB2’s battery is rated at 14.8 Wh, well below the international airline carry-on limit of 100 Wh. No special declarations are required for typical passenger travel. Always check with your specific airline for the latest regulations.
