How To Tell The Date On A Car Battery. The old battery had HMB 28226 12309 stamped onto its top face and a sticker on its side reading 14242309. My understanding is that if it is a Panasonic it is the original battery as Toyota does not sell the Panasonic in the US.
Most cars require 12-volt batteries that last from three to five years. R Plant that produced the battery. Exactly what the title says.
This is how we date all of our batteries.
Put the two pieces of information together from Steps 2 and 3 to get the date of manufacture for the battery. The year 2008 would be represented by an 8 for. 12V 55Ah 420 AEN and the lower row reads. The battery will be stamped with a coded date.
