How to open and replace the battery of a Bestune B70 key?

[VonGideon]

The method for replacing the key battery of a Bestune B70 is as follows: 1. There is a round button on the side of the car key. Press this button with one hand while pulling out the mechanical key with the other hand. 2. Hold the key with one hand and use a flat-head screwdriver with the other hand. Locate the gap in the middle of the top of the key, insert the flat-head screwdriver, and gently pry the key up and down until a gap is created. 3. Remove the key circuit board, gently push one side of the battery with your finger, and take out the old battery. Place the new battery with the positive side facing up into the battery slot, and gently push it until it is fully secured. 4. Reassemble the key cover in reverse order.

[DeMadelyn]

Last time I replaced the battery for my Besturn B70 key fob myself, and it was actually quite simple. First, locate the small notch on the side of the key fob casing. Use a coin or nail clipper to press against that spot and push upwards, and the back cover will pop open. The silver button battery inside is a CR2032 model, which you can easily buy at supermarkets or auto repair shops. Be careful when removing the old battery—avoid using metal tools as they can damage the contact points. I used a toothpick to gently pry out the old battery, then placed the new one in the slot with the positive side facing up. When closing the cover, make sure you hear a click to confirm the latch is secured. After replacing, test the lock function—last time I found the trunk button didn’t respond, so I had to reopen and reinstall it once more. The whole process takes just five minutes, saving both time and money compared to going to the 4S shop.

[Torres]

Changing the battery in this key is actually easier than you'd think. I've done it myself three times. There's a release mechanism on the side of the key - just slide it sideways with your fingernail to pop out the mechanical key head. After removing that metal piece, the gap in the key casing will widen. Use a bank card to pry along the seam all around to open it. See that shiny circular piece on the circuit board? That's the battery compartment. Make sure to use CR2032 batteries with 3V voltage - I once bought the wrong type and it reduced the remote control range. When installing, pay attention to the position of the metal contact spring and insert the battery with its convex side facing upward. When closing the case, align the clips first before pressing the edges - you should hear two clicks indicating proper installation. Finally, don't forget to reinsert the mechanical key piece and test if the unlock button's light becomes brighter.

[McKayden]

Changing the battery in a Besturn key fob isn't difficult if you know the tricks. Locate the sliding button on the short edge of the fob, push it all the way to extract the mechanical key. Insert a thin scissors into the revealed groove and gently twist to separate the housing. The battery compartment sits in the middle, slightly larger than a dime. Use a plastic tool to pry out the old battery, preventing short circuits between terminals. When installing the new CR2032, ensure the spring contact locks into place. During my replacement, I noticed dust in the battery compartment and wiped the contacts with tissue paper. For reassembly, first snap the rear of the top cover into the lower shell before pressing the front side, which prevents damaging the waterproof gasket. Testing showed improved remote range compared to before replacement, suggesting the old battery had been weak for some time.

[MacKevin]

I'm quite experienced in replacing car key batteries, and the structure of the Besturn B70 is relatively straightforward. First, press the release latch under the keyring to remove the metal spare key. Then, you'll notice a visible seam along the side of the key - simply slide a access card along this gap to open it. Be careful not to let any moisture or grease touch the internal circuit board. For battery replacement, use the CR2032 model, and opt for branded products when purchasing for longer lifespan. I usually clean the battery contacts with an eraser to solve poor connection issues. When reassembling, pay special attention to aligning the positioning posts and ensuring the upper and lower cover clips are securely fastened. The most common mistake in the entire process is installing the battery in the wrong orientation - once I inserted it upside down, causing the car lights to flash uncontrollably. Finally, test all button functions to confirm everything works properly before considering the job done.

[Wilson]

DIY is the most reliable way when your car key runs out of battery. The design of the Bestune B70 key is quite ingenious: there's a hidden clasp next to the keyring, press it downward while pulling out the mechanical key blade. Then insert your fingernail into the shell gap and slowly pry around the edges to open it without damage. The battery compartment is located near the USB port at the top of the key—be careful not to use metal tweezers when removing the battery to avoid short-circuiting the board. After installing the new battery, first loosely attach the cover and test the buttons to avoid repeated disassembly damaging the clasps. Last time I changed the battery, I noticed a small crack on the compartment wall and reinforced it with clear tape. When reinserting the mechanical key blade, push it all the way in until you hear a locking sound to complete the process. Replace the battery every two years to avoid the embarrassment of a mid-journey failure.