How many people know how old their car battery is?
They are expensive and to many a little mystical - they work one day and not the next - but when you go in for a routine service, how would you know if you came away with the same unit? What if one of the boys out the back decided your battery was newer than his and did a ‘midnight spares’ ? Would you know the difference after the shop pressure washed your engine bay and everything looked new again.
I’ve heard two stories recently about this kind of thing - maybe conspiracy theorists, but who knows …
One of the signs might be the codes stamped into the battery - I’ve checked two of mine, a Century with D21BB and some distance over, a Q in the middle of the top of the battery - another, some noname brand has D1JA and a C on the negative terminal. One wonders if there is rhyme or reason to these and to that end Century publish as somewhat helpful chart like this:
Which isn’t entirely clear given most of the month has more than one digit. I’ve read elsewhere that the years roll over every 10 and they miss letter I (India) so as not to confuse with numeral 1 (one), as no battery is likely to last that long I guess. So maybe my Century battery is Day Shift, 21st of February 2018?
Secret decoder ring anyone?
I wonder how many people get a surprise when they are told their battery is 3 years older than their receipt says?