1. Understanding the BIOS Battery
There are usually two batteries installed in laptops. One is the familiar main battery, which allows the laptop to continue working in places where there is no AC power; The battery is a BIOS battery, the function of this battery is to continuously supply power to some circuits on the motherboard after the laptop is powered off, in order to maintain the system time and enable changed settings of the BIOS to continue to take effect.
In many laptops, the BIOS battery model is CR2032, which is silver-white in appearance and only larger than a regular button cell (so this type of battery is commonly referred to as a "cell battery"). button "). This type of battery is a rechargeable lithium battery with a rated voltage of 3V (when the battery is new, use a multimeter to measure the voltage between3.2 and 3.4 V).
2. Convenient DIY replacement
Preparing tools: 35W soldering iron, rosin, solder bars, blades, insulating tape, tweezers, screwdrivers, etc. (Figure 2).
Step 1: Remove the keyboard and wrist rest. First remove the battery from the fuselage, then refer to the screw icon label on the bottom of the T40, use a screwdriver to unscrew the four No.3 screws, then unplug the cable connecting the keyboard and the motherboard from the motherboard socket. Tap the keyboard. Then remove 4 #1 screws, 1 #2 screw and 3 #4 screws, then remove the wrist rest.
Step 2: Remove the BIOS battery. The T40 BIOS battery is located between the optical drive socket and the wireless network card. The battery is covered with a transparent cover, which is easier to identify. Use tweezers to disconnect the battery cable plug from the motherboard socket and remove it.remove the battery.
Step 3: Remove the battery “core” from the BIOS. Use a blade to cut the outer cover of the battery, then use a soldering iron to solder the red and black wires of the battery (the red wire is connected to the positive terminal of the battery, and the black wire is connected to the terminal positive of the battery). negative terminal of the battery). Use a digital multimeter to measure and find that the battery voltage is less than 2V.
Step 4: Solder the BIOS battery. This step is the most critical step in replacing the laptop BIOS battery in amateur conditions. In amateur conditions, BIOS replacement can usually only be done using a soldering iron. The outer skin of the BIOS battery has a layer of chrome plating, making it difficult to achieve soldering. You can first use a blade to scrape the part of the battery thati needs to be soldered, then apply rosin on it, then use a soldering iron dipped in solder to solder. Generally, welding can be successful. It should be noted that when welding, the contact time between the soldering iron and the battery should not be too long, and the single-time welding time should generally not exceed 3 seconds, otherwise the new battery will be damaged or the performance of the new battery will be reduced. Additionally, the positive and negative terminals of the battery should not be incorrectly connected. Generally speaking, the side with the battery logo (such as battery brand, voltage, etc.) is the positive electrode, connected to the red wire, while the other side is the negative electrode of the battery, connected to the black wire.
Where is the laptop BIOS battery? How to replace it? Actually, it's not difficult at all. Just 4 Steps Can Teach You How to Replacethe BIOS battery. Of course, you need to understand it well first. BIWhat is an OS battery and what does it look like? Next, you need to have a complete set of essential tools. Then follow the steps presented by the editor step by step. The editor reminds you that a 5W soldering iron, rosin, some. soldering bars, and blades, insulating tape, tweezers, screwdrivers, no tools are missing.