The oldest of the second gen Mazda5's with istop are getting to about 4/5 years old now, and for most owners the batteries will be fairly tired, and your car will be out of warranty.
For those that don't know, the 2.0 DISI Mazda5 has the iStop system which is a forerunner to the full Skyactive e-Loop system. Basically the car has a main, larger, start/stop battery and a smaller battery bolted next to it that runs the ancillaries when the car is in auto shut-off mode. Both batteries were designed and built for Mazda by Panasonic.
The problem is, a dealer will charge you 250+installation to replace both of these, and the ancillary battery is described as 'dealer fit only' if you use most online parts lookup sites.
There is an easier way....
After much searching and research, the main battery is a type 053. Except, most online parts lookup tools will tell you it is a much larger battery which won't fit - so ignore them. Ideally, you want a an updated battery that is rated for start/stop applications. The official factory fit Panasonic battery just isn't available online to private buyers in Europe. Nobody seems to do a start-stop rated battery in 053 size, accept Yuasa, but nobody has any stock that I could find. The Vata battery site actually recommends a pretty much standard battery for this car (probably because it is considered a light duty start/stop application).
In the end I went for the best CCA rated 053 battery I could find -which was this Silver graded Yuasa:
YBX5053, HSB053
The ancillary battery is a little trickier as the code on the battery doesn't hit any English language sites and its size is a bit of an oddball. After much searching around, the code on the battery has an equivalent code of 34B17L. So I went for another Yuasa:
YBX3009
Total cost for the two : 85.
When the batteries were delivered I removed the two metal battery clamps from the old units and installed the new ones, and much to my relief, they fit. The leads to the ancillary battery were very small so you have to put a slight angle on it in the clamp for it to fit. Further relief when I found the car started, and no iStop warning lights.
The only issue then is that iStop won't actually work as you have to put it through the battery learning procedure that is a little convoluted, but steps 4-8 here worked for me a treat:
https://euroesi.mazda.co.jp/esicont/eu_eng/mazda3/20110724140058/html/id011736800500.html
So, for anyone that is facing a large bill from the dealer on these batteries, I hope this helps. I read quite a few forum posts from both Mazda3 and 5 owners that had been told all sorts of things about the battery setup and were basically forced into to paying stealership money - my advice is don't - all you need is the above batteries, a socket set with 10-13mm sockets, a wrench, and some latex gloves and you are golden.
For those that don't know, the 2.0 DISI Mazda5 has the iStop system which is a forerunner to the full Skyactive e-Loop system. Basically the car has a main, larger, start/stop battery and a smaller battery bolted next to it that runs the ancillaries when the car is in auto shut-off mode. Both batteries were designed and built for Mazda by Panasonic.
The problem is, a dealer will charge you 250+installation to replace both of these, and the ancillary battery is described as 'dealer fit only' if you use most online parts lookup sites.
There is an easier way....
After much searching and research, the main battery is a type 053. Except, most online parts lookup tools will tell you it is a much larger battery which won't fit - so ignore them. Ideally, you want a an updated battery that is rated for start/stop applications. The official factory fit Panasonic battery just isn't available online to private buyers in Europe. Nobody seems to do a start-stop rated battery in 053 size, accept Yuasa, but nobody has any stock that I could find. The Vata battery site actually recommends a pretty much standard battery for this car (probably because it is considered a light duty start/stop application).
In the end I went for the best CCA rated 053 battery I could find -which was this Silver graded Yuasa:
YBX5053, HSB053
The ancillary battery is a little trickier as the code on the battery doesn't hit any English language sites and its size is a bit of an oddball. After much searching around, the code on the battery has an equivalent code of 34B17L. So I went for another Yuasa:
YBX3009
Total cost for the two : 85.
When the batteries were delivered I removed the two metal battery clamps from the old units and installed the new ones, and much to my relief, they fit. The leads to the ancillary battery were very small so you have to put a slight angle on it in the clamp for it to fit. Further relief when I found the car started, and no iStop warning lights.
The only issue then is that iStop won't actually work as you have to put it through the battery learning procedure that is a little convoluted, but steps 4-8 here worked for me a treat:
https://euroesi.mazda.co.jp/esicont/eu_eng/mazda3/20110724140058/html/id011736800500.html
So, for anyone that is facing a large bill from the dealer on these batteries, I hope this helps. I read quite a few forum posts from both Mazda3 and 5 owners that had been told all sorts of things about the battery setup and were basically forced into to paying stealership money - my advice is don't - all you need is the above batteries, a socket set with 10-13mm sockets, a wrench, and some latex gloves and you are golden.