Mini keychain power banks: extra charge, ultra-compact size

Keep the essentials everywhere with our keychain power banks : mini size, 3000-5000 mAh , integrated USB-C/Lightning , sometimes PD 20 W for a quick boost on iPhone/Android. Ideal for everyday use (travel, evenings out, festivals), in addition to a power station or a classic power bank.

Why choose a keychain power bank?

  • Ultra-portable : key ring, pocket or EDC kit.
  • Ready in an emergency : start a call, pay wirelessly, geolocate, ticket... even at 1%.
  • Built-in connectors : universal USB-C, Lightning for older iPhones (depending on model).
  • Fast charging (depending on model): USB-C PD 20W for a compatible express boost.
  • Safety : over-current/over-voltage/temperature protections.

The 6 criteria that count

  1. Capacity : 3000-5000 mAh = 40-100% of a modern smartphone depending on usage.
  2. Power : 12-20W (PD) to charge recent iPhones/Androids faster.
  3. Connector : USB‑C (iPhone 15+ & Android) / Lightning (older iPhones).
  4. Integrated cable vs. rotating tip: practicality vs. versatility.
  5. Weight/size : clip/ring, anti-scratch coating.
  6. Aircraft compliance : < 100 Wh → authorized in the cabin (power bank).

Capacity & uses (benchmarks)

Ability Typical use Examples
3000-4000 mAh Help Call + GPS + payment; ~40-60% of a smartphone
5000 mAh Daytime 1 partial recharge ~60-100% depending on model

Tip: To limit losses, use direct USB-C when possible.

External batterieskey ring: choose well

Ultra-compact, thekeychain power banksoffer the right amount of energy to end the day without stress: messages, navigation, photos, payment, emergency calls. To choose, look at thecapacity (mAh), therepower (W), THEconnector type(USB‑C/Lightning), and theprotectionsintegrated. Our models are selected for their reliability, theirEDC formatand their iPhone/Android compatibility.

iPhone & Android Compatibility

  • USB-C: universal (iPhone 15 and up, Android).
  • Lightning: for earlier iPhones (depending on model).
  • PD 20 W(depending on model): quick boost when the device supports it.

Instructions for use & maintenance

  • Recharge the power bank every 2-3 months if not in use (50-80%).
  • Avoid heat/freeze; carry it in a dedicated pocket or kit.
  • Use certified cables; check the condition of the connectors.

Frequently Asked Questions

Can a keychain battery charge an entire smartphone?

Yes for 5000 mAh on many compact smartphones; otherwise, expect a useful partial recharge (40-80%) depending on capacity and model.

Is it allowed on airplanes?

Yes, it is apower banksmall capacity (< 100 Wh), permitted in the cabin. Check your airline's policy.

PD 20W vs 5V/2A: What’s the difference?

THEPDadapts voltage/current to charge compatible devices faster, especially from 0 to 50%.

Complete your setup:External batteriesAndChargers & CablesFree delivery in France, 30-day returns, 2-year LymobileShop warranty.