Bawareca wrote:jadnashuanh wrote:Apples and oranges....
Wasnt it obvious?
My whole point for this discussion, and my decision to go with a larger battery, is that if there is the slightest consumption over the normal sleep mode (0.05-0.15A) the 12v battery will go flat and it will probably be dead too. It happens, and will happen with the modern BMWs.
My car has no warranty and i have no desire to buy $170+ battery multiple times and deal with dead car recovery with my wife inside. Or rely on a tow truck driver to jump-start it To each it's own, I just share my modification and the logic behind it.
I agree after having to rescue my Mrs when the battery failed.
The 20ah battery is underspec'd and of questionable quality
A 40ah battery is cheaper and less likely to fail
All 3 of my cars have had failed batteries its an epidemic and a weak point on the car so you can learn from history or be doomed to repeat it, your choice...