배터리 교환 수리 사례

2026. 7. 17. 작업

난이도 & 준비물

증상

I understand that AC Delco encodes the month of manufacturing a car battery using two digits and encodes the year by one digit. The battery I just purchased, for example, is labeled P124R, which, IIUC, means that it was made in December 2014. I'm puzzled by this ambiguity regarding the decade of manufacture. How does a buyer rule out he's dealing with an exceptionally unscrupulous retailer who put on the market 10+ year-old stock? Just as importantly, how can a manufacturer of AC Delco's renown make the date this ambiguous? Is it, for instance, the case that a battery that has been sitting on

처리 내용

NOTE: Much of your question seems to be a rant, so I will answer the last part, which seems to have gone unanswered to this point. According to the Battery University , a typical lead acid battery will lose about 5% of its charge every month (whether this means 5% of of the total charge when completely full - ie: 5%, 10%, 15%, etc, or 5% of the remaining charge - ie: 5% of 100%, 5% of 95%, 5% of 90.25%, etc, is unclear). This means if a battery sits on the shelf too long, it will need recharged after a period of time to be fully operable in a vehicle. That is for a battery which is stored wet (with acid in the cells). A dry battery (one without an electrolyte) will maintain on the shelf indefinitely. Once the electrolyte is placed in the cells, the process begins. There is another factor which will make a battery go bad. According to the same website: With usage and age, however, the flooded lead acid builds up sludge in the sediment trap, which causes a soft short when this semi-condu