Charging My iPhone Overnight Will Overload the Battery: FALSE

The one thing all the experts agree upon is that smartphones are smart enough that they do not let an overload happen. Extra protection chips inside make sure that doesn’t happen in a tablet or smartphone or even a laptop. Once the internal Lithium-ion battery hits 100 percent of its capacity, charging stops. That usually happens within an hour or two, tops.

If you leave the smartphone plugged in overnight, it’s going to use a bit of energy constantly trickling new juice to the battery every time it falls to 99 percent. That is eating into your phone’s lifespan (see below).


The best thing to do: Don’t worry about this too much. Plug the phone in when you go to sleep; if you wake up sometime in the night, unplug it to prevent constant trickle-charging. If you don’t wake much, plug your phone into a smart home outlet that you put on a schedule so it turns off.

Potential problems that could be encountered while charging overnight:

1) It is hot in here? The trickle charge can cause some heating up. Many experts recommend taking a phone fully out of the case to charge overnight. At the very least, do NOT stack a bunch of crap like books or other devices on top of a charging device. And for the love of Jobs, don’t put it under your pillow. Do any of the above and you can expect the phone to get hot—not necessarily enough for spontaneous combustion, but at least enough to damage the battery (see below). If you are afraid of fire, some in the UK recommend leaving the charging device on a dish or saucer while plugged in, or put it on something metal that is more likely to disappate heat, like a heatsink does on the chips inside a PC.

2) Bad Cables. If you’re using a knock-off cable that isn’t from the manufacturer, or at least “certified” in some way (iPhone Lightning cables should be MFi certified, for example), it could be a problem. The cord and connectors may not be up to the specifications needed for the phone or tablet. Don’t skimp by buying chintzy cables.

Will charging a mobile phone using a laptop decrease the laptop’s battery life?

A laptop battery typically has a capacity of 4000 to 10,000 maH and voltages ranging from 10 to 14 volts.

A cell phone like the iPhone 6 has a 1800mAh 3.7V battery.

First you are right, if the laptop is on charger than charging the cellphone by USB port does not cycle current from the laptop battery. The current comes from the laptop charger and only slows down the rate at which the laptop will recharge.

Second case, if the cell phone is charge from your laptop running on battery. Then the charge will come from the laptop battery and potentially reduce is life by using up charge cycles.

But the  iPhone 6 absorbes 6.7 WH for a full charge (3.7V x 1810 maH)
The laptop lets assume is a 10.2V 6000 maH system and therefore has energy of about 60 WH.

So charging a fully depleted iPhone from the laptop battery will take about 1/10th of the laptop charge.  or 1/10th of a discharge cycle. probably the laptop is rated for 1000 full discharge cycles? So a small part of its life is given up. I’d do it when travelling for convenience or emergency but not every night when at home.

Is it good to keep laptop batteries charged upto 100%?

It’s perfectly alright, you can work no problem

Well, modern batteries are intelligent enough to know whether they are fully charged or not, once they are completely charged the laptop automatically stops charging and starts working with direct D.C supply from the adapter.

I always connect my laptop to charger when i was in home and places where i have facility to connect.

This makes my battery give backup like the new one even after two years.

by the way, it will not increase the temparature. It even cools the laptop, because during charging battery heats up, it makes laptop hotter. If you connect it with charger, laptop works with D.C supply from adapter directly without the involvement of battery. so no heat will be generated from battery.

Out of battery,go charging?Oh no, your battery won’t accept!

A lithium battery, strictly speaking, is a lithium-metal or lithium alloy anode material, and a non-aqueous electrolyte solution is a disposable battery. The lithium battery we usually refer to is mainly a lithium-ion battery. It is a rechargeable battery that relies on lithium ions to move between the positive and negative electrodes to work. Lithium-ion batteries use an embedded lithium compound as an electrode material. At present, the main positive electrode materials for lithium ion batteries are: LiCoO2, LiMn2O4, LiNiO2 and LiFePO4.
Rechargeable lithium-ion batteries have a wide range of applications, and the batteries we use on various electronic devices are currently lithium-ion batteries. For example, mobile phones, tablets, laptops, and even electric cars.

The reason why it has such a wide range of applications is due to its superior nature. Taken together, it has high energy density, high average output voltage, low self-discharge, no memory effect, wide operating temperature range, excellent cycle performance, fast charge and discharge, high charging efficiency, large output power and long service life. There are quite a few advantages, such as no toxic or hazardous substances.
Lithium-ion polymer batteries are the most commonly used lithium-ion batteries and are very common on a variety of electronic devices. This lithium polymer is an improvement of ordinary lithium ion batteries. It replaces the liquid organic solvent in ordinary lithium ion batteries with colloidal or solid polymer. It has good safety, does not break out, and can shape various shapes. The battery. Therefore, such lithium polycarbon batteries are used in various handheld electronic devices and pure electric vehicles.

Compared with lithium-ion batteries on ordinary handheld electronic devices, lithium-ion batteries on modern pure electric vehicles have the following advantages:

1. The battery capacity is large. The battery capacity of modern pure electric vehicles is generally very large. For example, Tesla’s Model 3 series has the lowest battery capacity of 50 KWH, which is equivalent to 50 kWh. This large battery capacity is achieved by combining a series of lithium-ion batteries in series and in parallel.

2. The charging time is short. Today’s electric cars generally have a fast charge function. Generally, fast charging can be filled with 80% of electricity in half an hour, and the subsequent 20% takes a long time for security reasons. But this is already very convenient. For example, the domestic battery life of pure electric vehicles is generally around 200KM, 80% of the electricity has been able to drive around 160KM, which is enough for short-distance urban commuting.

3. Long battery life. The lithium polymer battery of a mobile phone or a notebook computer generally has a service life of less than 5 years, and the battery capacity will be seriously degraded after more than 5 years, which cannot meet the demand. However, the five years are short for electric vehicles and cannot meet the demand, because the average vehicle usage time will be more than 10 years. Therefore, the batteries of pure electric vehicles are generally improved lithium-ion batteries, and the service life is generally more than 10 years.

Of course, in addition to the above various advantages, lithium ion batteries also have some disadvantages, for example, intolerance to overdischarge. When overdischarged, excessively embedded lithium ions are fixed in the crystal lattice and cannot be released again, resulting in a shortened life, and deep discharge is more likely to damage the battery.

Therefore, using a low battery can damage the lithium ion battery. Therefore, whether it is a mobile phone, a laptop or an electric car, it should not be charged when the battery runs out. Generally speaking, if there are conditions, it should be charged when the battery has about 40%-50% of the battery. .

In addition, lithium-ion batteries are not tolerant of overcharging. When overcharging, the positive electrode of the battery will be deintercalated with too much lithium ions, and overcharging for a long time may cause the lattice to collapse, thereby irreversibly reducing the capacity of the lithium ion battery.

In short, the emergence of lithium-ion battery technology has accelerated the popularity of electronic devices, such as mobile phones and notebook computers. In addition, the commercialization of pure electric vehicles is also inseparable from the development of lithium-ion battery technology. Lithium-ion batteries with large capacity and fast charge and discharge will definitely drive the development of the pure electric vehicle market.

Should I use fast charging?

​Many Android phones have a feature that allows for fast charging, often referred to as Qualcomm Quick Charge or, in Samsung’s case, Adaptive Fast Charging – there are others.

These phones have special code usually located in a chip known as the Power Management IC (PMIC) that communicates with the charger you are using and requests that it send power at a higher voltage.

The iPhone 6 doesn’t feature fast charging, but its Qualcomm PMIC is smart enough to recognise when you use a higher-amp charger (like the one you get with the iPad), and that’s a good thing because fast charging will heat up that Li-ion battery and cause it increased wear and tear.

For the same reason, you should never leave your phone in a hot car, on the beach or next to the oven. A hot battery will suffer long-term effects on its lifespan. And so will a super-cold one, so don’t leave your device in the freezer or out in the snow.