Gadgets

6.83mm Thin. 5000mAh Strong. Meet the UltraSlim SS5K

A magnetic wireless power bank with semi solid state cells, pass through charging, and an app that tracks battery health, and cycles.

¥424,048

pledged of ¥325,469 goal

41 backers

12 days to go

3 reward tiers

Back on Kickstarter ↗

About This Project

The SMARTCOBY ULTRA SLIM SS5K redefines portable power by packing a 5000mAh battery into a mere 6.83mm‑thin stainless‑steel frame, enabling it to stay attached to a smartphone while providing continuous charge. Built with semi‑solid battery cells that have passed five rigorous safety tests, it features real‑time health monitoring via the NovaCore C3 app, showing cycle count, temperature and status. Pass‑through charging lets you power your phone while the battery itself recharges, and MagSafe compatibility ensures secure attachment. Available in silver or black, the SS5K is slated for delivery in December 2026.

Key Highlights

 ▸ Ultra‑slim 6.83mm profile with 5000mAh capacity – world’s thinnest high‑capacity battery. 

 ▸ Real‑time battery health via NovaCore C3 app: cycle count, temperature, and status monitoring. 

 ▸ Pass‑through charging and MagSafe compatibility let you charge your phone while the battery charges. 

Technical Specs

Spec	Details
Battery capacity	5000mAh
Thickness	6.83mm
Maximum power output	7.5W
Safety tests passed	5 (including nail puncture and 130°C heat)
Casing material	Stainless steel (0.30mm)
Adhesive surface	Glass fiber reinforced plastic (0.35mm)
Battery cell improvement	0.20mm thinner than conventional semi‑solid cell
Charging port	USB‑C
Status indicators	Five LEDs
App languages	Japanese / English
Estimated delivery	December 2026
Available colors	Silver, Black

Reward Tiers

backers

No Reward

JPY1

~$1 USD

Support the project for no reward, just because it speaks to you.

7 backers

SmartCoby Ultra Slim SS5K x 1 Super Early Bird (25% OFF)

JPY7,244

~$46 USD

Get 1 ultra‑thin 6.83mm SMARTCOBY — perfect for sharing or as a backup. • World’s thinnest 6.83mm • Semi‑Solid battery cells • MagSafe and CIO App Integration • Available in Black or Silver — you’ll select your color in a survey after the campaign ends.

backers

SmartCoby Ultra Slim SS5K x 1 Early Bird (15% OFF)

JPY8,210

~$53 USD

Risks & Challenges

Potential risks include component shortages or factory delays affecting timeline, possible quality‑control issues requiring extra inspection, and international shipping or customs holdups that could delay delivery to certain countries.