iPad cold can not be charged due to low battery temperature protection

Recently, there are many netizens who post messages saying that it is rare for them to spend a lot of time in the New Year. Cats play iPads in bed, but iPad can run out of power but can't charge enough, and it can only be used as a mirror. Some netizens said that this is because the weather is cold and the iPad battery is not for power.

From many netizens' postings, the problem of the iPad's cold and uncharged power is widespread, not only in the north, but also in iPads like Hangzhou, Changsha, and Guangzhou.

Even if there is no air-conditioning during this time, the indoor temperature in Hangzhou is generally above 5°C. In this ambient temperature, does the iPad really charge? Say no evidence, experiments prove!

In the office building, the iPad is charged at a room temperature of 14.6°C. According to the user's description, under the condition of normal charging of the iPad, a lightning plus battery symbol will be displayed in the upper right corner of the screen. If the battery is not charged, the sign is the battery plus the plug.

On January 28th, the outdoor temperature in Hangzhou was 3°C-6°C. At 5 pm, we first tested the office at Express Time. However, all the offices were searched, and even without air conditioning, the temperature in the office was around 17°C. Finally, we moved the experimental site to the staircase aisle. The thermometer showed that the room temperature was 14.6°C.

The test used a black iPad with a battery level of 49%. Turn on the power, plug in the iPad dedicated charger, iPad lightning screen sign appears in the upper right corner; charge 10 minutes, iPad battery capacity is displayed as 51%, has been successfully charged.

Apple iPad has been out of the second generation, and most consumers recently purchased a new generation of iPad2, then it will be iPad2 only charge the problem?

We also prepared a white iPad2. Before the test, the battery capacity of the iPad2 was 79%. At the same room temperature of 14.6°C, the iPad2 also showed a lightning sign after plugging in a dedicated charger. After charging for 10 minutes, the battery capacity increased to 81%.

In the stairway where the temperature of the office building was low, neither the iPad nor iPad2 that we tested had any problems with charging or not. Will the room temperature at 14.6°C not be low enough? Let's experiment again!

There is indeed a phenomenon that the iPad of the residential building facing the north room is not fully charged. The second experimental site is a residential building in Yuhang District of Hangzhou, a three-bedroom, two-roomed house. We chose a room with a north facing, low room temperature. At 10pm, the thermometer shows that the room's room temperature is 8°C. We put the black iPad and white iPad2 together to charge.

Plug in a dedicated charger, iPad still shows the lightning logo, but the iPad2 has a plug logo. After charging for half an hour, the iPad’s battery capacity increased from 51% to 67%; while the iPad2’s power remained at 79%, not charging it at all.

Experiments have shown that the iPad can be charged normally at a room temperature of 8°C, but the iPad 2 is not charged. So, this phenomenon will only appear on the iPad2? If room temperature is lower, what will happen?

At 6 o'clock in the morning the following morning, the room temperature of this room facing the north fell to 7.3°C. We first plug in the charger for the black iPad, and the plug logo appears in the upper right corner of the screen. It is charged for half an hour. Its battery capacity has not changed and it does not charge. Another white iPad2, plugged in the charger, or show the plug logo, but also not the same charge.

In the 7.3°C room temperature environment, iPad and iPad2 appear to be incapable of charging.

Apple Customer Service:

Tian cold iPad charge does not feed into the quilt filling the January 28, January 29 two days, Hangzhou is not too cold, the minimum temperature of about 3 °C, do not open the air-conditioned residential building north facing room, 7 The situation at °C-8°C is also very common. The iPad and iPad2 that we tested have not been charged. Is this normal? The "Curious Lab" telephone interviewed Apple's customer service staff.

"We have received many such calls during this period of time. If the temperature is too low, the iPad series cannot be charged. When it is not charged, it will appear with a small plug logo. This is only for the iPad, iPhone will not ."

But for the iPad in the low temperature environment, how many degrees this phenomenon occurs, the customer service staff said that this is not necessarily.

"It doesn't have a specific temperature standard. If you can't charge it, you probably know that there is no problem. It's the reason of temperature. To go to a warmer place, you can."

Apple's customer service staff recommends that in the winter, it is best to charge the iPad where there is heating or air conditioning. "If there is no heating, use a quilt or other things to heat it, and then recharge it."

"Curious Laboratory" according to Apple's customer service staff taught at 8 °C at room temperature, the iPad2 in the quilt charge, we put the thermometer's temperature probe together into the quilt. The thermometer shows that the temperature in the litter is 10.4°C and the iPad2 is charging normally.

Yu Xiaoping, an engineer at the Institute of Lithium Applied Engineering, Nanduyuan Research Institute, said that the iPad can't charge because its battery has too low temperature protection.

"General lithium-ion batteries will be set too low temperature protection, because the charge at low temperatures, the metal lithium in the battery will have a deposition phenomenon, resulting in internal short-circuit the battery situation."

Yu Xiaoping said that the low temperature protection of mobile phone lithium-ion batteries is set at about 0°C, and that of notebook computers is set at about 5°C. “This is for safety reasons. The bigger the battery capacity is, the more dangerous it is. The iPad is closer to the computer and it may have a higher level of protection.”

We opened the iPad's Chinese manual and only found the line "Please use the iPad at a temperature between 0°C and 35°C." No wonder the user shouted strangely when he encountered it in the winter when the room temperature was between 0°C and 8°C.