The Xiaomi Mi Band 4 fitness bracelet has become a hit with healthy lifestyle fans due to its functionality and affordable price. However, even such a reliable device can fail at the most inopportune moment — especially when there is no native charging cable at hand.
In this article, we will discuss 7 working ways to charge the Mi Band 4 without original charging, using improvised tools and alternative devices. It is important to understand that not all methods are equally safe - some can damage the bracelet if used improperly. So we will not only give step-by-step instructions, but also point out the critical points that will help to avoid breakage.
Before you start experimenting, check to see if you still have a backup cable from an older bracelet (e.g., from the Mi Band 3 or Mi Band 2), because the connectors are compatible and charging from them may be suitable. If there are no original accessories at hand, read on.
1.Using charging from Mi Band 3 or Mi Band 2
The easiest and safest way to do this is to use the charging cable from previous bracelets. Xiaomi Mi Band 4 has been backward compatible with the Mi Band 3 and Mi Band 2 connectors, so if you have an old cable, it should fit. Here's how to do it:
- 🔌 Connect the charging from the Mi Band 3/2 ce USB-A computer port, power bank or network adapter (5V/1A).
- 📱 Carefully insert the bracelet into the connector, combining the contacts. Make sure the connection is tight, but do not put too much effort into it.
- ⚡ The bracelet should have a charging icon on the screen. If that doesn't happen, try to move the bracelet slightly in the connector.
If charging has started, leave the bracelet for 1-2 hours until the charge is fully restored, a method that is 100% safe, as it uses original accessories from Xiaomi.
⚠️ Note: Do not use chargers with higher voltage 5V (This can cause the bracelet battery to overheat.
2. Charging through USB-port
If you don't have any original chargers on hand, you can try a homemade adapter made of improvised materials.
- 🖇️ Paperclip (or thin wire)
- 📄 Aluminum foil (optional for better contact)
- 🔌 USB-Type-A cable (from phone, mouse, etc.)
The essence of the method is to close the contacts of the bracelet with contacts. USB-Here's the step-by-step instructions:
- Untighten the paperclip so that two parallel "legs" with a length of ~ 1 cm are obtained.
- Wrap the ends of the paperclip with foil (if any) for better contact.
- Carefully insert the "legs" into the Mi Band 4 connector so that they touch the two extreme pins (usually "+" and "-").
- Connect the second end of the paper clip to USB-The cable is then cleaned (red) before the wires are cleared — "+", black — "–").
- Put it in. USB-cable to the computer port or charger.
If done correctly, the charge indicator will appear on the bracelet screen, a method that requires carefulness, as improper connection can cause a short circuit.
Remove the bracelet from your hand | Check the polarity of the contacts | Use isolated tools | Do not leave unattended
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⚠️ Warning: Do not touch bare wires while charging. If the paper clip or foil gets heated, turn off the bracelet immediately!
3. Charging from another fitness bracelet (Honor, Huawei, Amazfit)
Many other brands’ fitness bracelets have similar charging connectors, such as the Honor Band 4/5, Huawei Band 3 Pro or Amazfit Bip devices, which can be used to charge the Mi Band 4.
- 🔌 The connector is physically fit in size.
- ⚡ The charging voltage does not exceed 5V.
- 📏 The polarity of the contacts is the same (usually "+" and the - are symmetrically arranged).
Before you plug in, check the contacts of both bracelets. If they're visually similar, gently insert the Mi Band 4 into someone else's charger. If the bracelet doesn't start charging, don't make any effort, it can damage the connector.
| Model bracelet | Compatible with Mi Band 4 | Notes |
|---|---|---|
| Honor Band 4 | ✅ Yes. | Full compatibility, but it may require a light effort to connect. |
| Huawei Band 3 Pro | ✅ Yes (partially) | Sometimes a thin layer of foil is required for better contact. |
| Amazfit Bip | ❌ No. | The connector is different shape, but you can use the method with a paper clip. |
| Mi Band 5/6 | ❌ No. | The connector is magnetic and not compatible with the Mi Band 4. |
Charging from non-original devices may take longer (up to 3-4 hours) due to the difference in current strength.
4.Use of wireless charging (Qi-standard)
If you have wireless charging (for example, for a smartphone), you can try charging the Mi Band 4 with it.
- 📱 Qi charging (standard) 5W or 10W).
- 🧲 Small magnet (e.g., from an old hard drive or speaker).
- 📄 Thin foil layer or copper wire.
Instructions:
- Place the magnet on the charging pad (it will help keep the bracelet in the correct position).
- Attach a piece of foil to the back of the Mi Band 4 so that it touches the contacts.
- Carefully place the bracelet on charging, combining the foil with the center of the site.
- If the charging hasn’t started, try to move the bracelet slightly.
This method doesn’t always work, as the Mi Band 4 doesn’t support wireless charging out of the box, but in some cases, the induction current may be enough to recharge slowly.
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If you don’t have a magnet, you can use a metal coin (e.g. 5 rubles) to improve contact between the bracelet and the charging pad.
Charging from a battery type "pill" (CR2032)
In emergency situations, when you don't have access to a USB or outlet, you can use a CR2032 (3V) battery, which is suitable for short-term recharging, so that the bracelet lasts for several more hours.
- 🔋 Battery CR2032 (used in remotes, watches, motherboards).
- 🖇️ Two paper clips or thin wires.
- 📄 Scotch or tape.
How to proceed:
- Attach one end of the paperclip to the "+" battery, the other to the "+" contact of the bracelet.
- Repeat the same for the “-” contact.
- Secure the structure with tape so that the clips do not jump off.
- Leave for 10-15 minutes (no longer!).
This method will give the bracelet a minimum charge (up to 10-20%), which will last for several hours of operation. Do not use it often - the CR2032 battery is not designed for such loads and can overheat.
⚠️ Warning: Do not leave the bracelet connected to the battery for more than 20 minutes, risk overheating and battery damage!
Charging via headphone adapter (Type-C or Micro-USB)
If you have an adapter for charging headphones (for example, for Xiaomi AirDots or others) TWS-You can try connecting Mi Band 4 to it, and many of these adapters have universal contacts that are suitable for fitness bracelets.
What to do:
- Connect the adapter to USB-port or charger.
- Place the bracelet on the adapter contacts, combining the "+" and "-".
- If charging does not begin, try to put a thin layer of foil.
This method works about 50 percent of the time, because it depends on the adapter model. If you have a charging case from a Redmi AirDots or Haylou GT1, the chances of success are higher.
Why aren't all adapters suitable?
7. Alternative power sources: Power Bank, car lighter, solar panel
If you are on the road or on the road, you can use portable power sources:
- 🔋 Power Bank: Connect the homemade charge (with a paper clip) to the power bank.Make sure the output voltage does not exceed the power bank. 5V.
- 🚗 Car lighter: Use the car lighter USB-lighting adapter and any of the above methods.
- ☀️ Solar panel: Connect USB-cable to a portable solar battery (e.g., Xiaomi Solar Power Bank).
When using a car lighter, watch for the voltage -- some adapters give you 12V, which will instantly disable the bracelet. Always check the output parameters!
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The most reliable way to travel is to use a power bank with a 5V/1A output and homemade charging from a paper clip. Solar panels are only suitable in clear weather and require a voltage stabilizer.
Frequent Mistakes and How to Avoid Them
When trying to charge the Mi Band 4 without the original charge, many users make critical errors that cause the device to break down.
- ⚡ Incorrect polarity: If you confuse "+" And the "-" bracelet can fail. Always check the markings of the contacts.
- 🔥 High voltage use: Chargers from laptops (19V) tablet (9V) Burn the power controller bracelet.
- 💧 Moisture intrusion: Homemade charging with paper clips or foil can cause short circuits when in contact with water.
- ⏳ Long-term charging from weak sources: Batteries CR2032 or solar panels are not designed to fully charge – this can damage the battery.
If you've tried charging the bracelet, don't panic.
- Connect it to the original charger (if it appears).
- Leave on charging for 10-15 minutes - sometimes the controller "falls asleep" with a deep discharge.
- Reset your settings through the Mi Fit app (if the bracelet reacts at least somehow).
⚠️ Warning: If the bracelet heats up while charging, turn it off immediately! overheating the battery can cause bloating or even fire.