Saeyang Marathon K48 PRO + BS35 Review UK (2026)
The K48 PRO is the cordless Marathon with the highest speed ceiling. It takes the battery-powered, brushless formula of the K38 PRO and adds a 35,000 rpm BS35 handpiece and a colour LCD display — still with up to 8 hours of work on a single charge.
Quick Verdict
If you work mobile and want the same 35,000 rpm ceiling as the desktop Champion LSP sets, this is the cordless Marathon to buy. The brushless BS35 handpiece needs no carbon brushes, the colour LCD shows direction, battery, foot-drive and pause status at a glance, and pressing the speed knob pauses and resumes work at the same speed. Torque is the same 2.4 Ncm as the K38 PRO — fine for manicure, gel and light acrylic work, but below the 3.2–4.5 Ncm of mains-powered desktop units.
Best for: Mobile and home-visit nail techs who want the full 35,000 rpm range off the mains. Compare with: K38 PRO + BS30 at £429 — same battery, same 2.4 Ncm torque, but a 30,000 rpm ceiling and a simpler digital speed display.
What's in the Box
- K48 PRO control base (battery-powered)
- Brushless BS35 handpiece (Twist-Lock)
- Power supply / charger
- Silicone handpiece stand
- Manual
- 12-month distributor warranty
The SFP-27 foot pedal is an optional extra — it is not included in the set.
Buy the Marathon K48 PRO + BS35 at Coheal
View Product OfferKey Specifications
| Specification | Detail |
|---|---|
| Max RPM | 35,000 rpm |
| Torque | 2.4 Ncm |
| Motor | Brushless (BS35 handpiece) |
| Handpiece weight | 120g |
| Handpiece dimensions | Ø19.8 × 126 mm |
| Battery | Li-ion, 2850 mAh — up to 8 h per charge |
| Power | 20W |
| Input voltage | 12.6 V |
| Display | Colour LCD — direction, battery, foot drive, pause |
| Functions | Pause (press the knob), rotation direction, foot-drive switch, energy-saving mode |
| Overload protection | Yes — with warning signal |
| Control unit | 290g, 74 × 138 × 30 mm |
| Foot pedal | Optional (SFP-27) |
| Bit change | Twist-Lock system |
| Warranty | 12 months (distributor) |
| Price | £429 |
What Stands Out
35,000 rpm Without a Cable
The BS35 handpiece reaches 35,000 rpm — the same ceiling as the mains-powered Champion + H35LSP and H37LSP sets, and 5,000 rpm more than the K38 PRO. Most nail work happens between 15,000 and 25,000 rpm, so the extra headroom matters mainly for fast product removal.
Colour LCD Display
The colour screen shows rotation direction, battery level, foot-drive activation and pause status. Speed is set with the knob; pressing the knob pauses the drill, and pressing it again resumes at the previous speed.
Brushless BS35 Handpiece
No carbon brushes to wear out and replace, and low vibration. At 120g and just under 20 mm in diameter, the BS35 is one of the slimmest, lightest handpieces in the Marathon range.
Full Day on a Charge
The 2850 mAh Li-ion battery is rated for up to 8 hours, and an automatic energy-saving mode stops the battery draining between clients.
Pros and Cons
- 35,000 rpm — the highest ceiling of any cordless Marathon
- Colour LCD with direction, battery, foot-drive and pause status
- Brushless BS35 — no carbon brushes, low vibration
- Up to 8 hours on a 2850 mAh charge
- Light 120g handpiece
- Overload protection with warning signal
- 2.4 Ncm torque — below desktop units (3.2–4.5 Ncm) for heavy acrylic debulking
- Foot pedal is optional, not in the box
- £429 — you pay a premium for portability
Who Should Buy This?
Buy it if:
- You work mobile or do home visits and want the full 35,000 rpm range
- You like seeing battery and status information on a proper screen
- You want brushless, low-maintenance running
Consider instead:
- The K38 PRO + BS30 if 30,000 rpm is enough for your services
- The K38 Crafien Mini if you want a foot pedal included in the box
- A desktop Champion + H35LSP (£180) if you work from a fixed station — more torque for less money
How It Compares
Final Verdict
The K48 PRO is the cordless Marathon for techs who don't want to give up speed when they leave the salon. Same battery life and torque as the K38 PRO, but a 35,000 rpm ceiling and a clearer colour screen. If you work mobile and don't need a pedal in the box, this is the one to get.
Rating: 9.1/10 — the fastest cordless option in the Saeyang range.
Get the Marathon K48 PRO + BS35 at Coheal
View Product OfferStocked and sold by Coheal UK — UK stockist of genuine Saeyang equipment, sourced through Saeyang's official EU distribution network.
