Fuji Enviromax Type D LR20 battery, extra heavy duty, manufactured to be eco-friendly and powerful, Carbon Zinc - (12pack)

Update 18 days since purchase the first 4 batteries had lost their ability to power the device they were in.Considering that the first branded batteries took 5 months to loose their power on the same device - these batteries do not hold their charge, or were partially charged out of the packaging. Either way - not good performance and certainly not extra heavy duty!I have reduced the star rating down from 3 to 1. If I could return them I would, but unfortunately they have been used.Original ReviewThought that I'd try this brand as they seemed to offer good value for money. Unfortunately, the power seems to be a lot less than the rechargeable ones that I had used previously. Still monitoring the longevity of the first set - but initial signs are that they will last a lot less than a well known branded battery.

Claimed to be better constructed and more environmentally-friendly than their equivalents of years ago. Personally, alkaline batteries have been the personal default for decades originally for photographic equipment but latterly for remote controls, audio equipment and much else, several portable alarm clocks included. Superficially, their construction appears very similar in execution and standard of finish to the more expensive alkaline alternatives.Several repeated incidents with two battery-powered alarm clocks were batteries were replaced almost at the same time and with similar battery types has proven that the 'wisdom' of using alkaline for everything may not be advisable. An article found claiming that many clock movements can be 'over-driven' to the point of total failure by some high power batteries was noted and specifically the failure by their manufacturers to recommend them for use in clocks; zinc carbon batteries are said to be far safer to use although less readily available than they were.The manufacturers claim that "Fuji Enviromax, Eco Friendly Carbon Zinc Heavy Duty Industrial Batteries, AA, Pack of 12" are especially well-suited for use in clocks and other equipment where the potential for leakage and consequent internal corrosion would have once resulted in a recommendation to use alkaline only. Fuji think differently about these.It may be worth accepting the recommendation especially as these are substantially less expensive than alkaline batteries size-for-size and often a direct alternative.

Very disappointed with the life of these batteries to say they are supposed to be Heavy Duty-- wont last 7 days on Xmas LED lights (50 string) and only on for 6 hours a day

I'm using three of these at a time, to power a medium length string of low powered, outside, Christmas lights. I could have used re-chargeable batteries, but they don't always work well with some products. And, as I had some of these Fujji batteries from a packet I had got from Amazon for a clock that needs low power batteries, I have tried them in my outside Christmas lights. Three have so far lasted five night, powering my modest length string of outside lights. For a minimum of four hours a night; sometimes for six hours. I have turned the lights' brightness down to about two thirds full strength, but they still look good. PS. These lasted circa 7 nights, so a bit more than 30 hours. Considering the low price I felt that was ok.

Bought for our smoke alarms. Only complaint is they came in a multipack, but not with a great best before date (we only have 2 alarms and they're the only thing we own that requires a 9v). We gave some to family and friends, so even better value really if you wanted to split the pack with some people!

Absolutely useless. Wanted batteries to listen to my cds. Used CD twice and then it would not work. The radio would work but didn't have the power to play my cds.Useless. Dontbuy

Great value for money . I tried several local shops to me and when l asked for zinc carbon batteries they didnt seem to know what l wanted. I was using them for a clock that specificed this particular type of battery. Not wanting to ruin the clock , I looked on Amazon and sure enough you stocked them . Very quick arriving and my clock is running perfectly

I bought these batteries because they were the most environmentally friendly ones I could find for my lantern. I looked up details on a scientific web page that also said they last a long while. Arrived within 24 hours, fit and do the job.