: Duracell PC1604BKD Procell Alkaline Batteries, 9V (Pack of 12) – style and color may vary

These are great batteries for items needing a long time trickle option for ongoing charging.

They are batteries, they do what batteries do.

Used these for my smoke alarms….to keep everyone safe in our house….Working great!

I've been working with industrial electronics for over twenty years and have access to higher grade test equipment than the average end user so I did a quantitative analysis of the gray 9V batteries I received. Fortuitously, there was a (relatively) fresh proper yellow canned Duracell ProCell lying around the shop so I was able to add that to the comparison table. The basic analysis to take away is (with out dissecting the battery case) the cells appear to behave almost identically to the original yellow packaged ProCells, whereas the fresh plain "copper top" has a much higher internal resistance at load, the gray batteries match more closely with the yellow Duracell ProCell. The only thing I particularly don't trust is the crimp quality of the top and bottom of the can (evident in the attached comparison photo). Weaker crimp quality could create a situation where alkaline cell leakage can more easily "burst" the battery can, and the crimp quality difference is significant. The unit with "DURALOCK" on it was extracted from a piece of test equipment for visual comparison and not used in the test due it's age/wear.

The item is great.It took way too long to get a box of 9 Volt batteries.It took weeks to get them.

On time right item

I use this batteries every year to swap out the previous year's batteries from our smoke detectors, around the house.We no longer suffer through the dead battery chirps that used to plague us at night. These last all year, and then, after a year of use, still have enough power to run my guitar foot pedals. Plus they come with plastic caps to isolate the electrodes during storage, which are also reusable to storage after initial use.

I recently encountered a frustrating issue with Procell P1604BKD batteries. After installing one in my safe's electronic keypad, it began beeping the next day. Despite replacing the battery and confirming its expiration date (March 2026), the problem persisted.Consulting the safe manufacturer, I was advised to keep the door open and contact a locksmith, as drilling the door might be necessary. Fortunately, the locksmith was able to resolve the issue simply by replacing the Procell battery with a Duracell.This experience highlights the potential consequences of using low-quality batteries in sensitive devices. In my case, a faulty battery resulted in costly locksmith home call repairs.