Regarding the question of MP4 battery, MP4 power supply vs battery circuit

If half of the charge is still being charged, it will not cause damage to the battery.

If you unplug it before it is fully charged, it will not damage the battery.

If you run out of battery power and recharge it, it will cause damage to the battery.

It is best to charge it when there is about 10% of the battery remaining. Lithium batteries can be charged at any time, and they can be fully charged, and overcharging and over-discharging are harmful to the battery.

Of course it will be better! Replacing the nucleic acid battery will be relatively more durable!

Domestic things, that's it, it is recommended not to waste money, really, I used (Japanese Sony PSP) for 7 years, or the original battery, and then I bought a power bank, which is plug-in, 2400ha, with me, when I traveled, I found that the mobile phone, MP4, Sony PSP has no power, you can use the plug-in you carry, charge, very good, (it is sold in the local video game store, **at 50-65 yuan, regional price difference) It is recommended that you use! There is also a solar charger from Sony in Japan, which can charge PSP, mobile phones, and various handhelds, there is no need to buy it, ** more than 100 yuan,

It is not recommended that you charge the charger directly.

The 18650 battery is also a lithium battery, and the lithium battery is not like nickel-cadmium and nickel-metal hydride batteries, which can be overcharged and overdischarged.

Lithium battery must use PCB (circuit protector, you call it circuit board) in the process of use, PCB can play the following roles;

1. Overcharge protection;

2. Over-discharge protection

3. Overheating protection;

4. Short-circuit protection;

If you cancel the PCB, your battery will look like this:

1. After the charging time is too long, the battery will be charged, or it will leak overnight. Batteries are scrapped directly;

2. If the discharge time is too long, the battery will become a brick and can no longer be charged. This is the characteristic of lithium batteries;

3. The battery will be discharged with high current, or accidentally short-circuited, or leak at night. Batteries are scrapped directly;

From your description, it should be that your PCB is set up with a voltage stabilization function, and the voltage is indeed too low during the charging process, and the battery and circuit board output can only be charged. The actual output of the charger DC9V is definitely not more than 9V.

According to the situation you described, the original charging circuit should be in working order.

If the battery is equipped with a protective plate, it can be directly connected to the 9V for charging, but it will reduce the service life of the battery.

Theoretically, yes, but in this way, the battery is easy to overcharge and cause heating and scrapping, try it yourself, whether it will be obviously hot after charging for 2 hours, and the voltage is around after the two lithium batteries are fully charged. , or charge for half an hour after charging, to see if the voltage will rise, some of the current chargers are marked with 9V, but the actual voltage may be about 10V, which is a bit dangerous. I can adjust it to the best.

MP4 is also a lithium battery, the battery is not durable, there are generally several situations:

1. Aging of the battery. After using it for a long time, it is inevitable to replace it with a new battery.

2. The battery is damaged. For example, if the battery is exhausted, it will hurt the battery, and the battery will break down early if the battery is often used up before charging.

3. The battery quality is not good.

4. MP4 has mechanical failure and leakage.

There's a lot of talk from all of you upstairs, and I'm not going to repeat what you're saying.

In this case, the first is to determine whether there is leakage in the equipment The specific method I will personally talk to the landlord, and the other is to replace the lithium battery inside The battery cannot hold the power because the factory P4 lithium battery cell is not used well It is recommended that the landlord go to the mobile phone repair office to replace a BK battery Made in Germany Remember, it is best to find a repair place that can customize the mobile phone battery.

The price is suitable at 30-50 Generally, BK cell manufacturers** is 18 yuan, but it is normal for people to charge some manual fees.

I wish the landlord success.

If you buy it for a few days, you can go to the seller to ask clearly, you should be able to change the battery, you can use it for 3 hours to indicate that the battery is old, it is generally better to standby, and frequent switching on and off is not good for the machine.

Depending on the battery capacity, if it is too small, it is not possible to call it a long time of work.

Change to low-damping headphones, turn down the brightness of the screen, it's best to turn off the screen, and turn down the sound You can only increase some battery life through these small means.

It is very power-consuming to standby,MP4The first few times to charge, it takes about 5 hours,This can extend the battery life,If it really doesn't work, you can only go to the science and technology city,Change a battery of the same model。

Buy another battery.

It shouldn't be expensive, under 100 yuan.

You can connect it to the charger.,It is recommended that you set the brightness of the screen to the dark point,

OK. Buy a battery box.

But because of the relationship of electric current.

I still don't recommend buying it.

10 hours is not possible, and the battery must be changed frequently.

Yes, buy a backup battery box, with a No. 5 battery, **15 yuan.

It's better not to use it.

Because the charging is rated power, the battery voltage is unstable, so it will damage the machine in the long run.

Recommended Provincial Province.

The MP4 lithium battery will be slowly discharged after being fully charged, but the discharge current is very small, and it can be used normally after several months of storage.

MP4 lithium battery has a micro circuit board inside to control the battery charge and discharge, to prevent the battery from overcharging and overdischarging, the key devices used on the circuit board use MOSFET devices, the circuit board is usually in a state of micropower consumption, the power consumption is very small, almost negligible, as long as MP4 is used frequently and charged in time, there is no need to worry about the battery will lack power.

1) The first is the electricity on the freshener.

2) Be sure to turn off the charge for the first time, or do not charge while using 3) The first charge is moderately overcharged, and the power display is full, and it will still be charged for one to two hours.

4) If you don't have to worry about it, do it for the first three charges, and the battery will be much fuller!

Charge when the battery is still about 10% used, don't wait until it automatically shuts down and then flushes. Note: The temperature of the use environment and high temperature will affect the battery life.

Recharge when you run out, and recharge if you don't have any electricity. There is also a full of timely unplugging, don't overcharge.