How to charge Xiaomi Mi Band 5 without charging: proven ways at home

Why is the Mi Band 5 dead and the charger is not on hand?

The situation is familiar to many: the Xiaomi Mi Band 5 fitness bracelet has run out to zero, and the native charging cable has been lost, broken or stayed at work. Buying a new one is not always an option, especially if you need to urgently restore the device to work. Fortunately, there are several alternative ways to charge the bracelet without the original accessory.

The main problem with the Mi Band 5 is its proprietary charging socket, and unlike newer models (like the Mi Band 7 with a magnetic connector), the fifth version requires precise contact, which makes it difficult to use universal solutions, but does not make them impossible. In this article, we will discuss 7 working methods, from the simplest (with the help of the most common methods). USB-port to exotic (using solar energy).

⚠️ Important: all methods other than using the original or certified cable are potentially dangerous for the bracelet battery. The risk of overheating, short circuit or failure of the power controller increases significantly. If the Mi Band 5 is still on warranty, it is better not to experiment.

Method 1: Use of the USB-port of the computer or charger from the phone

The most affordable method is to connect the bracelet directly to the USB-It's a port of a PC, a laptop, or even a charger from a smartphone. USB-Type-A cable (standard "dad") and a little skill.

Step-by-step:

1. Take it. USB-cable (e.g. from an old mouse or keyboard) and gently cut the external insulation by baring 4 wires inside: red (+5V), black (GND), green and white (data).
2. Clean the red and black wires by 5-7 mm. Green and white can be bitten off - they are not needed.
3. Hold the bare ends to the contacts on the back of the Mi Band 5. Red wire is to + (usually marked as VCC or 5V), black wire is to - (GND).
4. Lock the wires with tape or tape so they don't move. Connect the USB to the power source.

✅ Pros: does not require the purchase of additional accessories, works with any USB-device.

❌ Cons: high risk of short circuit if the connection is incorrect, possible damage to the port USB.

To unblock the red and black wires in USB-cable|Check the polarity of contacts on the Mi Band 5|Lock the wires with tape.|Use a power source 5V/1A-->

Method 2: Charging from a battery of the type "Crown" or finger batteries

If you have a 9V battery (like a Crown) on hand, or even a regular AA/AAA finger battery, you can build an improvised power circuit, which is suitable for emergencies when there are no other options.

How it works:

• 🔋 For the battery. 9V: Use a 100-200 ohm resistor to lower the voltage to a safe one. 5V. Connect the plus batteries to + on the bracelet, minus - k -, and the resistor set on the plus line.
• 🔋🔋 For finger batteries (1.5V): Connect 3 batteries in series (total) 4.5V) And plug it in directly, without the resistor. 6V — It's already risky!

⚠️ Attention: without resistor voltage higher 5V The Mi Band 5 charging controller may be damaged. If the bracelet does not turn on after such a charge, the voltage stabilizer is most likely burned.

Method 3: Using wireless charging (Qi-standard)

If you have wireless charging for a smartphone (such as the Xiaomi Mi 11 or iPhone), you can try charging the Mi Band 5 through it.

Algorithm of action:

1. Take a piece of copper wire (diameter 0.3-0.5 mm) and bend it in the form of bracelet contacts.
2. Apply the wire to the back of the Mi Band 5, paired with the + and - contacts.
3. Place the bracelet on a wireless charging so that the wire touches the surface of the bracelet, and the charge should begin if the distance between the coils does not exceed 2-3 mm.

📌 Nuance: the efficiency of this method is extremely low — the bracelet will charge 5-10 times slower than the original cable.

I have never tried alternative methods.|USB-port|Krone batteries"|Wireless charging|Another option-->

Method 4: Solar battery charging or powerbank with USB

If you are outdoors or on a trip where there are no sockets but there is a solar panel (for example, for tourist equipment) or powerbank, you can use them to charge the Mi Band 5.

Connection options:

• ☀️ Solar panel: if it gives 5V, Put it on the bracelet through USB-If the voltage is higher, use a step-down converter (e.g., a module) LM2596).
• 🔋 Powerbank: If it has any USB-exit, just connect the bracelet through a homemade cable (see Method 1). 1A.

Critical information: Solar panels without a voltage stabilizer can deliver up to 20V at peak moments, and connecting such a source directly to the Mi Band 5 is guaranteed to bring it down.

Method 5: Using a charging from another fitness bracelet

If you or friends have other fitness bracelets (like the Huawei Band 4, Honor Band 5, or even the Mi Band 4), you can try using their chargers, the main thing is that the connector is the same size and location of contacts.

Compatible models (checked by users):

⚠️ Attention: even if the connector looks similar, the polarity of the contacts may differ. + and on both devices.

💡

If you have 3D-Printing adapter for charging from Mi Band 4 to Mi Band 5.Drawings are available on Thingiverse on request "Mi Band 5 charging adapter".

Method 6: Charging via motherboard (for advanced users)

This is only suitable for those who are versed in electronics and willing to risk the device, the essence of which is direct connection to the contacts of the battery on the bracelet board.

What you need:

• 🔧 Screwdriver for opening the case (preferably plastic).
• 🔌 soldering iron with a thin sting or tweezers.
• 📊 Multimeter for voltage testing.
• 🔋 power supply 3.7V–4.2V (For example, another lithium-ion battery).

Step-by-step:

1. Carefully open the body of the Mi Band 5 by pulling the latches around the perimeter. Don't use metal tools - you can damage the display.
2. Find two battery contacts on the board, B+ (plus) and B- (minus), which are usually signed.
3. Connect the power supply to the contacts, keeping polarity in mind. The voltage should not exceed 4.2V!
4. Charge for no more than 30 minutes, then turn off and check if the bracelet is switched on.

❌ Risks:

• Damage to the display plume at autopsy.
• Overheating of the battery with improper charging current.
• Loss of water resistance after assembly.

💡

Charging through a board is an extreme method. If you are not sure about your soldering skills or can not test the voltage with a multimeter, it is better to abandon this method.

Method 7: Alternative chargers (purchased adapters)

If experimenting with homemade circuits isn’t for you, you can buy a universal charger for fitness bracelets, which are inexpensive (from 200 to 500 rubles) and often support multiple models.

Popular adapters:

• 🛒 Universal charging for Mi Band 4/5/6 — Magnetic connector compatible with most Xiaomi models.
• 🛒 Amazfit/Xiaomi 2-in-1 charger – suitable for the Amazfit Bip and Mi Band bracelets 5.
• 🛒 USB-charging with spring contacts - a universal solution for any gadgets with open contacts.

🔍 What to pay attention to when buying:

• Check out reviews – some Chinese adapters have an inverse polarity.
• Make sure the device supports a charging current of no more than 1A.
• Avoid adapters without certification – they can damage the bracelet.

Frequent Mistakes and How to Avoid Them

When trying to charge the Mi Band 5 without the original cable, users often make critical mistakes.

1. Incorrect polarity. Connecting plus to minus and vice versa can burn the power controller. Always check with a multimeter or tester.
2. The bracelet is designed for 5V. A voltage above 5.5V can knock it out.
3. Charging from a laptop power supply (19V) or a car lighter (12V) without a converter is a surefire way to kill the device.
4. Bad contact. If the wires or contacts are wobbly, the charging will be interrupted, which can cause the controller to fail.

⚠️ Warning: If the Mi Band 5 stopped turning on after you make a homemade charge, don't try to reconnect it to power, this could be a sign of a short circuit inside the device, in which case you'd better take the bracelet to the service center.

FAQ: Answers to Frequent Questions