Replacing a dead battery on a Mazda key fob? Don’t buy a cheap one (updated)

Six months ago, the battery in my 2010 Mazda 3’s key fob (aka “flip-key”) totally died and I needed to replace it. The battery in these things is a CR1620, which I couldn’t find anywhere in stores, so I ordered the cheapest ones I could find off eBay — a pack of 3 generic brand Eunicell (made in China) for $2.18 CAD shipped. Unfortunately, I didn’t have a good first experience with them. There’s an orange LED that should light up whenever you press a button on the key fob. On a working key fob that still contained the original Panasonic battery from the manufacturer, the LED was bright and solid, but on the one I had just replaced, it was flickering and dim. I actually couldn’t get the first battery to work, so I had to take a 2nd one from the 3-pack, and that eventually did work, but never 100% reliably. I also had to reprogram the key fob to be recognized by my car. I concluded that these batteries were just “weak” or underpowered, or that the eBay seller was giving me old/used stock (I now realize that this wasn’t true. EDIT: it turns out my original suspicions were probably correct; see update below!). Anyway, a week ago, I sought out a brand name and ordered a 5-pack of Sony batteries (made in Japan) from Amazon, which cost me $13 all in (including Ontario taxes).

cr1620-batteries-side-by-side-crop

Left: 5pcs Sony CR1620 (made in Japan), about $2.60 each.
Top-right: Original Panasonic battery (made in Indonesia).
Bottom-right: 3pcs Eunicell (made in China) from eBay, about $0.73 each.

Funny enough, today while I had the key disassembled and was about to replace the Eunicell battery with the Sony, I thought back to the time when I fixed a broken mouse button by simply cleaning the electrical contacts. In my Mazda’s key fob, there are two silver-coloured metallic prongs which contact the battery on the opposite half of the fob. I couldn’t see any visible dirt on these contacts, but I could feel a bit of grime on the battery itself, so I just scratched it off with my fingernails until it felt smooth. Sure enough, this fixed it, and the key worked right away! Each button press now produced a solid orange light, and this is with the same Eunicell battery that I had written off before. I didn’t even have to reprogram it this time. I guess the cheap stuff from eBay isn’t so bad after all. Wish I had thought of this before spending the money on new ones, but oh well. Anyone need 5 new, unopened Sony CR1620 batteries? 😛

UPDATE 2015-Nov-14: 2-3 months after I wrote this post, my key fob with the Eunicell started flickering again. I replaced it with the Sony battery I bought earlier and it’s been going strong ever since.

Conclusions

  1. The Eunicell branded battery is several times cheaper and works perfectly fine. UPDATE 2015-Nov-14: I no longer recommend buying Eunicell batteries or any cheap batteries in general. This would be the second time I made this mistake! (The first was a replacement battery for a Samsung smart phone that ended up being just as bad as, or worse than, the 2-year-old original battery that it was supposed to replace. It was labelled as Samsung, but clearly a fake at 1/4 the price.) Buy a known brand from a trusted seller instead.
  2. Cleaning electrical contacts can work wonders. It’s a free fix and works for all kinds of stuff like computer mice, batteries for small electronics, and even a Toyota Prius

Oh, and just in case someone came here expecting a how to guide, here are the links that I found most helpful:

  1. Thank you for taking the time to write up your experiences and to follow them up. Great advice!

  2. 2015 Mazda 3 Key Fob Battery | Mazda Car Accessories Zoomzoomlane.com - pingback on September 19, 2019 at 1:49 am
  3. Mazda 6 Key Fob Battery | Mazda Car Accessories Zoomzoomlane.com - pingback on September 19, 2019 at 1:53 am
  4. Thingiverse is a universe of things. Free evansville craigslist for Android. We are a coeducational community of learners and teachers working to achieve excellence through a strong academic program. Admissions Portal. Problem with Craigslist Phone Verification?. Holy Name of Jesus School is an inclusive community dedicated to teaching children confidence, compassion, and integrity, while staying committed to academic excellence and the Catholic faith in New Orleans, LA Episcopal Academy admissions information from Test Innovators. IU School of Medicine-Evansville offers a unique mix of clinical experiences for medical students thanks to strong support from local physician-educators. Whole Body Cryotherapy In Evansville. Holy Comforter Episcopal School believes that each child is a unique creation of God.

    https://www.wissl.co.uk/contact/

  5. A bit introverted, but trying to become more social new year’s resolution that’s not going well. If I sound like someone you would like to get to know, then send me a message! Asian woman searching mature dating site Naughty woman looking to have fun Iowa City Iowa girls sluts for money Geneva TX adult personals.

    http://www.tmsaugusta.com/des-moines-iowa-girls-just-sex.html

Leave a Comment

Trackbacks and Pingbacks: