Xiaomi electric shavers are popular among men who value technology and convenience, but over time, even high-quality lithium-ion batteries lose capacity as the razor begins to run out of power. 10-15 If your Mi Electric Shaver (or other brand model) shows similar symptoms, it’s probably time to replace the battery.
In this article, you will find step-by-step instructions for replacing Xiaomi’s razor battery (including Mi Electric Shaver models). 1S/2/2S/2C/3/4), We'll give you tips on how to choose the original or analog battery, and also warning you about typical errors, and we'll look at what tools you'll need, how to disassemble the body without damage, and what to do if the razor doesn't turn on after you replace it. Special attention will be paid to safety – work with lithium-ion batteries requires caution!
Signs that Xiaomi’s razor battery needs replacement
Before you start disassembling the device, make sure that the problem is the battery.
- ⚡Britva discharges for less 20 minutes of work (at the stated time) 60-90 minutes of autonomy).
- 🔋The charging indicator flashes red or quickly switches from green to red after disconnecting from the network.
- ⏳Charging takes more 4-5 hours (norm — 1.5-2 hour).
- 🔌Britva only turns on when the charger is connected.
- 💥The body swelled or a characteristic smell appeared (signal of critical wear and tear!).
If at least 2-3 You know the item on the list, the probability of a battery failure is 90% But check before you replace it:
- 🔌Charging cable and power supply (try charging a razor from another adapter).
- 🧼Cleanliness of contacts at the razor and docking station (oxidation can mimic battery problems).
- 🔧Device settings (some models have an energy saving mode that reduces running time).
Important: if the razor body is swollen or you smell a chemical, immediately stop using! This battery can ignite. In this case, we recommend you contact the Xiaomi service center or dispose of the device according to the rules for recycling lithium-ion batteries.
What battery to choose for replacement: original vs analogues
The choice of battery not only determines the life of the razor, but also its safety. Low-quality lithium-ion batteries can overheat, swell or even ignite.
| Type of battery | Pluses | Cons | Price (2026) |
|---|---|---|---|
| The original (Xiaomi) | Guaranteed compatibility, optimal capacity, safety | Expensive, hard to find on sale | 1 500–2 500 ₽ |
| Analog (Baseus, Remax brands) | Cheaper than the original, often with increased capacity | Low quality risk, possible charging problems | 600–1 200 ₽ |
| Universal (18650, 14500) | Low price, easy to buy | Requires soldering, risk of incompatibility | 300–800 ₽ |
For most models Xiaomi suitable battery with parameters:
- 🔋Type: Li-ion (lithium-ion).
- 📏Size: 14500 or 18650 (depending on the razor model).
- ⚡Capacity: 600 to 1200 mAh (originals are usually 800–900 mAh).
- 🔌Voltage: 3.7 V (standard for most razors).
Where to buy it?
- 🛒Official Xiaomi Store (if available originals).
- 🌍AliExpress (look for sellers with a rating above 98% and reviews about compatibility with your model).
- 🏬Local electronics stores (for example, “Svyaznoy”, “M. Video” – but the range is limited).
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Before buying, check the labeling on the old battery! original Xiaomi batteries usually show the razor model and settings (e.g., the battery pack, MS112 3.7V 800mAh).
Tools and preparation for battery replacement
To replace the battery in the Xiaomi razor, you will need:
Screwdriver cross (PH0 or PH00)
Plastic mediator or guitar mediator
Tweezers (to extract plumes)
A soldering iron with a thin sting (if the battery is soldered)
Flush and solder (for soldering works)
Multimeter (to check the voltage)
Strain or shrink tube
Alcohol and cotton swabs (to clean contacts)-->
Also prepare the workplace:
- 📸Take a picture of the razor from all sides before disassembly – this will help to properly collect it back.
- 🪑Work on a table with good lighting (ideally a lamp with a magnifying glass).
- ⚡Turn off all appliances nearby – Lithium-ion batteries are afraid of static electricity.
- 🧤Wear an antistatic bracelet or periodically touch a grounded object (such as a heating battery).
If your battery is soldered to the board (like in Mi Electric Shaver models) 1S/2), For beginners, we recommend using lead-free solder and flux gel, which will make it easier. 3/4), No need for a soldering iron.
What if there is no soldering iron?
Step-by-step: how to disassemble the Xiaomi razor and replace the battery
The disassembly process varies from model to model, but the overall pattern is the same. 2S (one of the most popular models).
Step 1: Removal of the knife block
1. Turn off the razor and take it out of the docking station (if any).
2. Press the knife block lock button (usually sideways) and pull the block up. In some models, you need to turn the block counterclockwise.
3. Carefully put the knife block aside - do not drop it so as not to damage the blades!
Step 2: Disassembly of the hull
1. Turn the razor over and find hidden latches (usually) 2–4 It's all perimeter-wise. It's the Mi Electric Shaver. 1S/2 They're hidden under rubber inserts.
2. Put the body under a plastic mediator, starting at the junction of the halves. Move carefully so that the latches do not break!
3. If the body does not respond, slightly heat it with a hair dryer (temperature not higher than 50).°C - this will soften the glue (if used).
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Don't use metal screwdrivers to disassemble! They leave scratches and can damage the plastic.
Step 3: Remove the old battery
1. When you take the top cover off, you'll see the battery. 2/2S It's glued to the body, in 3/4 — It can be fixed by a plastic holder.
If the battery is soldered:
- 🔥Heat the soldering iron contacts on the back of the board (no more than 3 seconds, so as not to overheat).
- 🪢Carefully tuck the wires with tweezers and remove solder.
- ⚠️Don’t pull the wires – they are thin and can come off!
3. If the battery is on the connector, just disconnect the plug.
Step 4: Installation of a new battery
1. Check the polarity! Red wire, plus (+), black-minus (−). The board and battery usually have a marking.
If a new battery is unwired:
- 🔥Seal the wires, observing polarity.
- 🛡️Close the contacts with a seal or shrink tube.
3. Put the battery in place and fix it (with glue or holder).
Step 5: Assembling the razor
1. Connect the knife unit and check the operability until full assembly!
2. Turn on the razor: if it works, assemble the body in reverse order.
3. Hold the latches, they have to click.
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After assembly, allow the battery to fully discharge and recharge 2-3 times, which will help to “rock” the new battery and extend its life.
Common Mistakes and How to Avoid Them
Even with a careful replacement, you can make mistakes that will cause the razor to fail.
⚠️Warning: If the razor doesn't turn on after the battery is replaced, don't try to charge it! This can short-circuit. First, check the polarity and quality of the solder joints.
- 🔋Polarity is confused - the razor will not work, the battery may overheat.
- 🔥Overheating when soldering - can damage the board or battery. Use a soldering iron with a power of no more than 30 watts.
- 🧲Metal shavings, you short circuit. Work on a clean surface.
- 💧Moisture intrusion - even drops of sweat can cause corrosion.Use gloves.
- 🔌Poor contact - if the wires are not soldered to the end or the connector does not sit tightly, the razor will turn off.
If the razor after replacement:
- 🔴Not included. → check the polarity, multimeter measure the voltage on the battery (should be ~3.7 V V).
- 🟡Blinking indicator → Maybe the short circuit protection is working.
- 🟢It's working, but it's discharged quickly. → new battery needs calibration (full discharge-charging cycle 2-3 times).
How to prolong the life of a new battery
To make your new battery last longer, follow these tips:
- 🔋Don't keep your razor on charge all the time. Lithium-ion batteries deteriorate from overcharging. The optimal way to charge is to charge 80-90% and keep the discharge below 20%.
- 🌡️Avoid extreme temperatures. Do not leave your razor in the sun or in the bathroom (humidity) + heat accelerates degradation).
- 🔌Use the original power adapter. Cheap charging can deliver unstable voltages.
- 🧼Clean contacts once every 2-3 months with alcohol - oxidation worsens charge.
- 📅Keep 40-60% charge if you don’t use a razor for a long time.
The average life of a lithium-ion battery is 2-3 years (or 300-500 charge cycles), which can be extended to 4-5 years with care.
Alternative options: repair service vs purchase of a new razor
If you are unsure of your abilities or razor warranties, consider alternatives:
| Option | Pluses | Cons | Cost (2026) |
|---|---|---|---|
| Self-sustaining replacement | Saving money, experience in repair | Risk of damaging the razor, need tools | 600–1 500 ₽ (battery) |
| Repairs at the service | Work guarantee, professional equipment | Expensive, long (1-3 days) | 1 500–3 000 ₽ |
| Buying a new razor | New equipment, warranty 1-2 years | Expensive, environmentally unsustainable | 3 000–8 000 ₽ |
When should you choose a service?
- 🛠️If the razor is warranty (self-repairing it cancels it).
- 🔥If the battery is swelling - its disposal requires special conditions.
- ⚙️If you have a model with a complex design (for example, Mi Electric Shaver 4 with a sealed body).
When is it better to buy a new razor?
- 💰If the cost of repair exceeds 50% of the price of the new device.
- ⏳If the razor is more than 5 years old, modern models are more efficient and safer.
- 🔋If in addition to the battery there are other malfunctions (wear of knives, engine failure).