One device. Swappable batteries. Built-in cable. Wattz is the last power bank you'll ever need.
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Detachable Battery Module
Carry two pre-charged 21700 cells and swap in seconds — one click out, one click in. Instant full charge with no wall outlet needed.
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Built-In 3-in-1 Cable
The fast-charging cable is permanently attached. Supports Lightning, USB-C, and Micro-USB — one cable covers every phone on the market.
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22.5W Super Fast Charge
Supports PD 20W and Huawei 22.5W super fast charging. Get from 0 to 50% in under 30 minutes on any compatible device.
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Universal Compatibility
Works with iPhone 12–16, Samsung, Xiaomi, Huawei, OnePlus — right out of the box, no adapter needed.
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Airplane-Friendly
At ~18.5Wh per cell, each battery is well under the IATA 100Wh airline limit. Carry multiple cells in your hand luggage without any hassle.
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Solder-Free DIY
No soldering required. Standard 21700 cells are available worldwide — buy locally and never pay for proprietary replacements again.
How It Works
Power On the Go, Your Way
1
Load a 21700 Battery Cell
Slide any standard 21700 lithium cell into the Wattz housing. No tools, no soldering — it clicks in and locks securely.
2
Plug In the Built-In Cable
Unfold the integrated fast-charging cable and connect to your phone. Lightning, USB-C, or Micro-USB — covered.
3
Charge at 22.5W
Your phone charges at full speed immediately. The LED indicator shows remaining battery level at a glance.
4
Swap When Empty
Battery dead? One-click eject, drop in a fresh cell, back online in seconds — no outlet needed.
Technical Specs
Every Detail Counts
Engineered for reliability. Tested for real-world performance.
Battery Cell21700 Lithium (5000mAh)
Max Output22.5W Super Fast Charge
USB-C OutputPD 20W
Huawei FCP/SCP22.5W
Built-In CableLightning + USB-C + Micro-USB
Battery IndicatorLED Level Display
Battery SwapOne-click, solder-free
CompatibilityiOS, Android, Huawei
Airline Compliance✅ ~18.5Wh (under 100Wh)
Warranty2 Years
Gallery
See It in Action
What You Get
Everything in the Box
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Wattz Power Bank Case
× 1
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Built-In 3-in-1 Cable
Lightning / USB-C / Micro
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21700 Battery Cell
× 1 (5000mAh)
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User Manual
× 1 (Multilingual)
Customer Reviews
4.9
★★★★★
1,100+ verified reviews
5 ★
88%
4 ★
8%
3 ★
3%
2 ★
1%
1 ★
0%
★★★★★
I pre-charged three cells and traveled for 4 days without touching a wall outlet once. The built-in cable means I also stopped carrying a bag full of wires. Total game changer.
★★★★★
Went through security at 3 different airports — zero issues. Fast charge actually works: iPhone 15 from dead to 60% in about 40 minutes. Exactly as advertised.
★★★★★
The swap mechanism is satisfying and solid — nothing cheap about it. Ordered a second one as a gift. Packaging was premium, arrived in 10 days to Germany.
FAQ
Common Questions
Do I need to buy batteries separately? ▾
No — one 21700 cell (5000mAh) is included. You can buy additional standard 21700 cells at any electronics store to extend your range.
Which phones does the built-in cable support? ▾
Lightning (iPhone), USB-C (Android, iPad, Samsung), and Micro-USB (older Android). One cable covers virtually every phone.
Can I bring multiple cells on a plane? ▾
Yes. Each 21700 cell is ~18.5Wh — under the 100Wh airline carry-on limit. Check your airline's policy on the number of spare batteries permitted.
Is soldering required to change batteries? ▾
No soldering at all. The Wattz uses a solder-free click system. Any standard 21700 cell slides in and out with a single press — no tools needed.
How long does shipping take? ▾
Orders ship within 24 hours. Delivery: US/EU 7–14 days, UK 7–12 days, Australia 10–18 days. Tracking number provided by email.
What if it doesn't work for me? ▾
30-day money-back guarantee, no questions asked. Contact support and we will issue a full refund or send a replacement.
