Replacement Key Battery VL2020 Fit for BMW 1 3 5 6 7 Series E90 E92 E93 Entry Keyless Remote Smart Remote Control Key Fob

If you do not have a soldering iron and can solder 1/2-way decently, this is not the battery for you - and you need to have someone who fixes cell phones swap your battery out. IF you know how to solder, the entire process takes about 15-20 minutes and the battery is a perfect match. The pins are polarized / keyed (meaning: one is pin-style, the other is blade-style - which means you cannot accidentally install the battery backwards - the pin/blade perfectly match the original battery posts which get soldered the circuit board). You will need to take a razor (utility knife) and start separating the original key fob on the key end, then gently separate the case halves w/ a small flathead screwdriver (the case halves are glued together - so either be prepared to re-glue them w/ superglue, or better yet - pay $12 and get a brand new key fob case (which snaps open/closed) - search Amazon for the description listed below). Desolder the old battery and resolder on the new one ... the battery will likely come UNcharged (dead) and you will need to put it in your key fob socket and drive around for 30 minutes to charge it.There is also a Youtube video which shows this process.new key fob case (includes BMW logo):"(Just a key Shell) NEW Replacement Car Smart Key Keyless Entry Remote Key Shell Case for BMW 525i 325i M6 M5 650i 550i 128i 135i 328i 328xi 330Ci 330xi 335i 1 3 5 7 X5 X6 KR55WK49127"

This battery gives you plenty of room to solder (especially for beginners) to the chip board. Straight forward and installed in 5 minutes. Battery worked right away after putting it into the car.

Yes, you have to cut open the key fob. Yes you have to solder out the old and solder in this one. Yes you need to reprogram your key to the vehicle IF the battery has been dead for a while. Yes you have to glue the key fob back together. Youtube will really help for this.Still beats the dealer, getting the lazer key cut for 16 times the price of this.

Battery arrived dead and doesn't seem to be charging up. Very disappointing.

This battery worked perfectly for my application. So issues as of yet and came charged straight from the box. Yes, you do have to solder the battery onto the chipset. You do have to know how to solder or else this won't work for you, you'd be better off spending the $260+ on a new key. The flares on the larger leg were cut a little long, no problem! Just bend the leads to fit your case, it's easy! If this battery didn't work for you, then you did something wrong or don't know how to properly solder. You'll want to wear gloves or wash your hands with isopropyl alcohol before doing this job. Electrolytes from your sweat can in fact damage the board, so please make sure you're paying due diligence when performing this job or get it professionally done. It's not the batteries fault if you messed up🤷🏼‍♂️

Slight modification was needed on the larger tab with a dremel tool to make it fit flush, was not prepared for that but got it done which is why I’m giving it 4 stars instead of 5. Soldered it up (1st time ever soldering) I would recommend taking it to someone who works on phones to solder it if you don’t trust yourself doing it or watch soldering videos like I did. Was able to unlock the car/trunk and drive on the first try. Only worry is how long the battery will last, will update on that.

The title says it all, I’m very pleased with this purchase. No modifications we needed to the tabs, they were 90° and fit the circuitboard holes just fine. Also, the battery arrived well-charged with 3.09v. I plan to order a second battery for my other key.The accompanying photo shows the new battery fully and installed onto an E46 diamond key fob circuit board. I’m a novice at soldering, but it was simple and took less than 10 minutes start to finish (excluding gluing the fob shell back together and pairing to my BMW).

The battery is the exact same that was removed from the fob. The difference was the height of the prongs to be soldered in. This was a very simple job. What I did was wedge a small screwdriver between the battery and circuit board to split apart as I heated the existing solder points. The original came out with ease l, leaving enough behind to put in the new. With the prongs a little high, I snipped the top so they wouldn't interfere with the top (button side) of the fob. I then positioned the new batter prongs just under the soldering points where they were just inside the board only. With a little pressure, heated up each point again soldering the replacement battery prongs in place. There was a small gap between the board, so I took some small needle nose pliers squeezing the battery to the board. (Pliers were on top of soldering points). The prongs bent slightlly resulting in a flush install. If you don't do this you'll have negative pressure from the contact point and the battery likely ripping it off over time. Additionally, I reused the black sticker on the factory battery to ensure no electrical contact with the circuit board. I then sealed it with liquid electrical tape (basically black rubbery-plasticy glue) and clamped it until cured. All is well! Hope the battery lasts 8 yrs like the original.