I recently received two walkie talkies, which were indeed very useful after receiving them. However, I found that the battery of one of the walkie talkies cannot be used properly. It should be due to long-term power loss, battery damage, and inability to charge.
I tried some methods for repairing lithium batteries online, but they were unsuccessful. Therefore, I considered using a new battery cell for repair.
Many people don’t know that if the battery of a detachable walkie talkie is damaged, it can be replaced by replacing the internal battery cells instead of purchasing the entire battery.
Let’s talk about the specific replacement process below.
Firstly, use a hair dryer to heat the gaps around the battery casing, and then use a flat screwdriver or iron plate to slowly pry open the gaps until the entire battery casing is opened.
After opening the battery shell, you can see the 903450 lithium-ion battery cell. Here, 903450 refers to the length, width, and height of the battery. This battery is packaged in an aluminum shell. After cutting the wires and measuring, it was found that the battery itself has a voltage of about 3.8v, but after passing through the protective board, it dropped to about 2.5v, indicating a short circuit on the protective board.
When buying a new polymer lithium battery, you can actually buy a battery with a larger capacity as much as possible while balancing capacity and volume. Of course, it is not advisable to fill the battery casing too full to avoid potential expansion hazards in the future, nor to blindly pursue capacity, as it is too large to fit into the casing. I still bought a 903450 battery cell here, with a built-in protective board and a nominal capacity of 2000mAh.
The installation method is to connect the wires according to the positive and negative poles. Install the battery cell back into the battery casing and glue it onto the casing. There is no problem measuring the positive and negative voltage of the battery, and it can be used normally after being fully charged.
Some old walkie talkies use nickel hydrogen batteries. In fact, as long as the output voltage is the same and can reach the original transmission power, they can be replaced with lithium batteries. After all, lithium batteries are the mainstream now, with small size, light weight, and large capacity. However, when replacing nickel hydrogen batteries with lithium batteries, the charger needs to be modified accordingly, by removing the original charging control board and replacing it with a lithium battery charging control board.
