The actual stop starting of the engine is not an issue, it is not like the days of old, having to crank for 15 seconds before it would fire up.
But when the start stop modern engine is stopped, the Hvac blower motor is still running, the lights are still running, the stereo is still running, rear window defogger. Other Thats a pretty significant load.
How long do the headlights stay on after the button is pushed to turn of fthe engine. the parasitic loads of door locks, engine comuters, ect are all asking a lot of any battery in any modern vehicle with all the bells ans whistles and butt wiping technology the modern consumer has been trained to not be able to live without.
Todays starter batteriea are getting cycled and we know just how long it takes to top charge a battery.
My 89 with a 318 engine starter draws ~140 amps, but the engine always catches quickly.
Back when my AGm battery was newer I could hold it at 14.7 volts until my ampmeter read 0.0 amps. no doubt it was accepting somewhere around 0.025 amps or less, but that is not germain to this example.
When i would start the engine, and the alternator gets the battery back upto 14.7v, how long would it take for amps to taper back to 0.0? 0.0 amps would indicate the alternator has returned that which was used to start the engine.
So how long did it take for amps to retaper back to 0.0? under 45 seconds. Not 5 minutes, not an hour to replace that which was used to start the engine, but less than 45 seconds. So this chronic short trip driving never being able to return that which was used to start the engine is horse hockey, unless the tris were only 30 seconds long.
But if the battery was at 80% then an hour of 13.6v certainly is nowhere near enough to return the battery to anywhere near full charge
It is a fact that many modern cars, certainly not all, are intentionally cycling the batteries so that the battery is low enough that when the brakes are hit, the voltage regulars demands 14.5ish volts and the alternator must make 40+ amps to instantly bring the ~75% charged battery to 14.7v. This is intentionally cycling the starter battery and intentionally keeping it in a chronicaly undercharged state and if any rv'er were intentioally doing so and saying it was just fine we would all have a conniption and the caps lock button would be on on every response.
If the automakers are demanding a lead acid starting battery which can last through the warranty period in such duty, it is a good thing for us. I do not believe it is a good idea to intentionally keep the starter battery in a constantly undercharged state, but they are trying to meet fuel economy standard regulations, and some new cars are also using 0w-16 weight oils to get that 0.05% more mpg as well, and there are pages and hours worth of arguing on that front regarding any possible benefits of low viscosity motor oils.
These 'ERB' batteries could be just marketing mumbo jumbo, but if it helps starter battery manufacturers to modify a lead acid battery's plates to be more resistant to living their life at partial state of charge, more freaking power to them.
The Firefly Oasis Carbon foam lead acid AGM batteries are apparently performing well in marine uses, living most of their life at partial states of charge. I do not find it hard to believe that whatever they doing regarding the plate material and carbon, is making its way into other lead acid batteries.
