How to change the mobile phone battery into a power bank: analysis of hot topics on the Internet and practical guide
With the popularity of mobile devices, power banks have become a daily necessity. Recently, the topic of "renovating used mobile phone batteries into power banks" has soared across the Internet, and its characteristics of both environmental protection and practicality have triggered widespread discussion. This article will combine the hot data of the past 10 days, structured analysis and transformation methods and precautions.
1. Statistics of hot spots across the entire network (last 10 days)
| platform | Amount of related topics | Highest number of reads | core concerns |
|---|---|---|---|
| 12,000 items | 5.8 million | security controversy | |
| Tik Tok | 4300+ videos | 32 million views | Visual tutorial |
| Station B | 210 tutorials | 1.5 million views | Professional dismantling |
| Zhihu | 670 questions and answers | 420,000 likes | Circuit principle |
2. List of necessary materials for renovation
| Material name | quantity | effect | alternative |
|---|---|---|---|
| Lithium battery protection board | 1 piece | Prevent overcharge and overdischarge | Disassemble old boards (need to be inspected) |
| DC-DC boost module | 1 | Output 5V voltage | USB charging module |
| 18650 battery cell | 2-4 sections | power storage | Used mobile phone batteries (need to be tested) |
| plastic casing | 1 set | Insulation protection | 3D printing/waterproof box |
3. Step-by-step transformation tutorial (key points)
1.Battery screening stage: Select a used battery with a capacity >2000mAh and use a multimeter to check the voltage. 3.7V-4.2V is the available range.
2.Circuit connection: Weld the protective plates in the order of positive and negative poles. When connecting batteries in parallel, the voltage difference must be kept <0.1V, and the capacity must be matched when connecting batteries in series.
3.Boost module debugging: Adjust the output voltage to 5.0±0.2V, and the current is recommended to be 1A-2.1A. Overloading will cause serious heating.
4.Security testing: After running at full load for 30 minutes, check the temperature of each node. If it exceeds 60°C, add a heat sink.
4. Top 5 recent popular issues
| question | frequency of occurrence | Professional answers |
|---|---|---|
| Can batteries of different brands be mixed? | 217 times | Mixing is strictly prohibited. Differences in internal resistance may cause explosion. |
| Are bulge batteries available? | 189 times | Absolutely prohibited, the electrolyte has leaked |
| How many W fast charging does it support? | 156 times | Recommended ≤18W, need to install a temperature control switch |
| Can I pass airplane security? | 132 times | Homemade products without certification are prohibited from being checked in/carried |
5. Expert advice and risk warnings
1. The "magnetic direct charging modification" that has become popular on Douyin recently has the risk of short circuit, and an isolation film must be installed for normal operation.
2. Zhihu electronic engineer @PowerGeek suggested that the fuel meter needs to be recalibrated after every 200 cycles. If the error is >15%, it should be disabled.
3. Weibo hot search #power bank spontaneous combustion incident# shows: 78% of accidents are caused by inferior protection boards, and it is recommended to use the TP4056 chip solution.
4. Actual measured data from the UP owner of Station B: the average efficiency after the transformation is about 65%, and branded power banks are usually above 80%.
Summarize: Although the mobile phone battery modification power bank is creative, it needs to strictly follow the electrical regulations. It is recommended that novices choose finished kits to start, and used batteries should be recycled by professional organizations. Environmental protection and safety are equally important!
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