Battery OEM Mazda or Deka

I have some extended experience with a lightweight battery in my daily driven 2006 Boxster S, which is well known for the demands it places on the battery. In spite of that, I successfully used the Deka ETX30L (21 lbs.) for almost 3.5 years.

EDIT: Confirmed fitment (duh) and ordered the Deka through Batteries Plus. This battery seems to be best fit as its reserve capacity is nearly double that of the Optimas.

I have had excellent results from a Deka Intimidator 9A48 High Performance AGM Battery Deka / Remy part # 9AGM48 installed Dec 2010

I don't recommend anything less than the DEKA ETX-20L for a car that see true street duties. The ETX-14 is 200 CCA @ 12 lbs, and the 4 lbs weight loss isn't worth it for 70 CCA loss on a small battery in charge of starting a car. The ETX-18L does 270 CCA @ 16 lbs and much more suitable for our 4 banger application. The ETX-18 however is the one I recommend to 95% of readers of this thread. It cranks out 300 CCA at 18 lbs, which is still plenty light.

I've always had sucess with the Deka ETX-20L in the DSMs, two EVOs, a Saturn race car, and now the TT (most of them running on E85 which is hard to start on cold winter mornings). As long as you discipline yourself to not run accessories with the engine off, they are a great option!

I had an Optima 5 or 6 years ago but I heard the quality has went down and the warranty isn't as good as it used to be. I picked up a Deka intimidator deep cycle battery and It's by far the best battery I've owned.

I got a deka 15 and i love it

Even then the Mazda oem battery is trash. My battery only last me 15k miles, and I bought it new.

I Have had the Mazda CX60 Azumi Tukami G40 Turbo 6cl petrol engine for 12 months now and have had this back at the dealership several times. I believe I have the lemon of the bunch.

Continual Istop issues, it has needed reprogramming twice. The battery has failed testing and needed replacing.

the stock battery only lasted 3 years. My VW prior lasted 7 on the OEM battery.