I just bought a brand new car (Honda Accord Touring 2017). Its battery recharge characteristics are:
- loses 1/3 of its charge in 4 days (if the car is resting. See test attached) - loses 1/3 or its charge even after medium trips (photos in test attached) (For example: after 28 miles, battery goes from 12.61 V to 12.31 V). - thus, would require manually-charging nearly every day (because my daily trips are typically less than 28 miles. by not charging in one week, I had a flat battery after 1 week of normal driving).
In contrast, I believe (let me know if you disagree) "maximum" recharge characteristics should be to:
- lose 1/3 of its charge in ~12 days (if the car is resting) - lose 100% of its charge in 1 month (T = C/i = 45/0.05 = 900 hours) - alternator-charging by driving 6 miles every ~4 days, or - manually-charging once a week or once a month.
My Honda Dealer looked at the car and dismissed the problem by saying:
- There is nothing wrong with the car - This battery discharge amount is normal because the car has many computers - We would only replace the battery if it was not charging - We only follow Honda tests which do not show any issues.
MY QUESTIONS IS: In your experience, what are "normal" recharge characteristics of modern cars (are they different or about the same as my belief above)? The answer would indicate if I am stuck with a problem car. In that case, suggestions on the next course of action are appreciated.
My full test steps, methods, and photos are at http://bit.do/BatteryTestAccord2017 .