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How much is the voltage of the PLC battery to be replaced with a new one?

Lithium battery for PLC storage, the battery should be replaced when the voltage is lower than 3V.
When the PLC user program is to remain in the RAM, the battery is used. The battery is usually a 3V or 3.6V non-rechargeable lithium battery. The battery life is usually about five years. When the battery is used for a long time, the voltage will be Falling, when it falls below enough to guarantee data in RAM, the program in RAM is lost. If the user does not have a backup program, it will be quite troublesome.
The general PLC has a battery voltage detection circuit inside. When the voltage drops to a certain level, the PLC will alarm and remind the battery to be replaced. The PLC’s instruction manual provides a way to replace the battery. Generally speaking, after the PLC is powered off, because the RAM power supply terminal of the PLC is connected with a charging capacitor, even if the battery is removed, the charging power on the capacitor is sufficient for the data in the RAM to remain for a period of time, so if the battery is removed in a short time (usually 5 minutes) Then replace the new battery, the data will not be lost.
However, the environment in which the user actually uses the PLC is different, for example, the capacity of the capacitor is reduced, and the RAM power supply circuit has
Dust, sludge, etc. form a discharge circuit, which will speed up the discharge speed of the capacitor after the PLC is powered off, thus making the time difficult to grasp. If you replace the battery while charging, you can keep the program safe. Because the power will always
There is a voltage applied to the power supply pin of the RAM chip. Of course, you should also be careful when changing, pay attention to the polarity of the battery and avoid short circuit.
It is best to power on the PLC for 15 minutes (charge the internal capacitor), power off, change the new battery within 5 minutes, and then power on it.

What is the fast charge mode？

Mobile phone manufacturers are limited by the size of their mobile phones and their battery capacity is limited, so they began to turn their attention to fast charging. Fast charging is a technology that increases the charging power of mobile phones within a reasonable range and aims to quickly replenish most of the power for mobile phones. The charging power is equal to the current multiplied by the voltage. There are currently two solutions that can increase the charging power, high voltage, small current and low voltage and high current.

For example, the process of charging a mobile phone is like a process of dripping a mineral water bottle with a hole in the bottle. To speed up, first squeeze the water bottle to make the water flow faster, which is the high voltage and small current. The second is to tie another hole. At the same time, the water flow doubles. This is the low voltage and high current.

High voltage and small current

In 2013, Qualcomm introduced the Quick Charge 1.0 standard to increase the charging efficiency by increasing the input current, allowing the handset equipped with the Snapdragon 600 processor to support 5V/2A”/charging. However, due to the limitations of the micro USB interface, the input current should not be too large, so Quick Charge 2.0/3.0 can increase the power by increasing the supply voltage, which can achieve 9V/2A. In 2016, Qualcomm introduced the Quick Charge 4.0 standard, which is said to support the optimal voltage intelligent negotiation algorithm to provide the most suitable charging voltage for the battery. In addition to Qualcomm, MediaTek’s Pump Express Plus 1.0/2.0, Samsung’s Fast Charge, and Meizu’s charge 3.0 also use this high-voltage, low-current solution.

Low voltage and high current

Remember to charge for five minutes and talk for two hours? In 2014, OPPO introduced VOOC flash charging technology with a charging power of 22W. VOOC flash charging is a typical low-voltage and high-current solution, but as mentioned earlier, the micro USB interface will limit the current, so OPPO has customized the charger and charging cable, and even the internal circuit of the mobile phone has been modified to support 5V/4A. At present, OPPO’s dual-cell SuperVOOC super flash charging has a maximum charging power of nearly 50W and can charge 40% in 10 minutes. Also using this solution is Huawei SuperCharge Super Fast Charge, plus DASH Flash Charger.

Most Android phones that support fast charge will be equipped with a fast charge charger. There are exceptions, of course, so don’t ignore the accessories when buying the product. Be sure to look at the voltage and current requirements above.

High-voltage small current and low-voltage high-current are all in order to solve the charging problem, and there are differences due to different solutions to the micro USB problem. But now it is progressing, becoming smarter and safer, and micro USB is now undergoing changes, and mobile phone charging will become more and more perfect in the future. But now, you can turn on the “power saving mode” or choose the right fast charge charger to speed up.

My Battery Develops a ‘Memory’: FALSE

Developing a “memory” was a problem with older nickel-cadmium (NiCad) batteries. That’s where the whole “I gotta discharge the battery entirely” thing came from. Like we said, it’s not necessary on Lithium-ion batteries.

So why do Lithium-ion batteries not seem to last as long as they age? It’s not about “memory,” it’s about capacity. Your smartphone battery over its lifetime degrades enough that in the same amount of time charging, a new phone could hit a full charge, while an older phone might only get to around 82 percent in that same charge time. BatteryUniversity calls it “old man syndrome.”

Another way to look at it is that newer batteries are just hungrier to suck up all that power.

Apple claims that “Apple Lithium-ion batteries are designed to hold at least 80 percent of their original capacity for a high number of charge cycles” but also admits that the amount differs from product to product.

Apple iPhone batteries also support “fast charging” so they’ll get to 80 percent pretty quickly. After 80, you’ll see the capacity increase slowly, some of which is to prevent heat build up, and that extends battery life. But guess what? Fast charging isn’t great for Lithium-ion battery either—it makes the corrosion go even faster.

The current iPhones come with a 5 watt, 1 amp charger block which works, but of course, you can charge faster with a 5W, 2.1A charger. If you stick to the Qi-based wireless charging, also keep in mind, most support 7.5W, with wireless fast charging now available after recent iOS updates.

Best thing to do: If you are going to charge overnight, don’t fast charge. Use a slow charge. That means your charger should be lower voltage.

My Battery Should Always Drop to 0 Percent: FALSE

Running a smartphone until it’s dead—a full discharge—every time is not the way to go with modern Lithium-ion batteries. Don’t even let it get that close to 0 percent. That wears out a Lithium-ion battery even faster than normal. Partial discharge is the way to go.

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Batteries are on borrowed time from the get-go. The insides are in a state of decay that can’t be helped. Over time, they’re simply going to hold less and less power. If you’ve got an old iPhone 5 or 6 still in use and wonder why it’s only got a charge for a few hours compared to the almost full day you got when it was new, that’s why. The capacity diminishes over time.

The only time you would want to go out of your way to use up a smartphone battery all the way to 0 is to effectively recalibrate the internal sensor that displays your phone’s battery level. It’s hardly guaranteed—in fact, many people don’t think it works at all—but it’s recommended by some, especially if you’ve got a phone that hits 10 percent (or even 20 or 30) and seems to just die.

Even if you do go all the way to shutdown, that may not mean it’s at 0 percent in the battery. Leave the phone be for a few hours, if you think this is worth doing. Then give it a reset (holding down the Home and sleep/wake button simultaneously) for good measure.

Best Thing to Do: Plug the phone in before it asks you to enter a low-power mode(on iPhones, iOS will ask you to turn that on when you hit 20 percent power). Plug it in when the phone is between 30 and 40 percent. Phones will get to 80 percent pretty quick if you’re doing a fast charge. Pull the plug then, as going to full 100 percent when using a high voltage charger can put some strain on the battery. Keep it between 30 and 80 percent charged to increase battery lifespan.

(BTW: Fast charging like we’ve seen in Android phones for a while finally arrived in the iPhone 8 and X. Before, it took an iPhone a couple of hours to go up 50 percent. Now, Apple claims the 8 and the X go from up 50 percent in only 30 minutes with the right chargers. That requires a USB-C power adapter, which in turn means owning a special USB-C-to-Lightning cable, neither of which are included; or using a higher voltage charger like the one from an iPad or even a MacBook.)