iStop is a very pricey, often misunderstood feature. It's more for the environment...the reduced FC, a bonus....& there will be that batt cost penalty. Mazda is inclined to keep the SRP close to current(thus, the planned removal) but retain GVC.
Re batt swaps, iStop relearning has 2 methods...thru dealerships & a step by step DIY procedure. Some reportedly have had luck....no issues from not doing any procedure after batt replacement. And, if you have a memory saver tool, you'll be spared, too. There are a number out there....here's 1....
OEMTOOLS 24453 OBD-II Memory Saver | eBay
For the DIYer, verify w/ dealership if this old method still works for the KF CX5...
iStop relearning DIY:
1. Warm the engine up. Turn everything electrical off that you can - radio, A/C, lights, chargers, etc. Bring it close to electrical load.
2. Switch the ignition off.
3. Switch ignition to on but dont start engine. Long-press the i-stop OFF switch for 3 s within 5 s after switching the ignition ON.
4. Start the engine.
5. Press the i-stop OFF switch. Verify that the i-stop indicator light (green) flashes and stays flashing. If it does not flash, go back to Step 3.
6. Allow the engine to idle for 10 minutes, or until the i-stop indicator light (green) turns off. Mine didnt stop flashing so after 10 minutes or so i just went to step 7.
7. Switch the engine off. Wait a minute or two.
8. Start the engine. Go for a drive, and check that the i-stop system operates normally. Those with i-stop will know that you may need to drive a mile or two until it activates. Remember that i-stop will not operate when (a) for diesels...when engines are in DPF regen mode, and (b) in those other conditions stated in the manual. Also, if a new battery was fitted, it may take some time for the new battery to fully charge up before i-stop will start working. Go for a decent drive so it gets fully charged.
9. If i-stop operates as normal, reset it was a success.
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