Why Shouldn’t I Mix Batteries?

iStock
iStock

The fine print on many packaged batteries warns users not to mix old and new batteries or different battery brands. What’s the worst that could happen?

According to Rayovac, the performance of your battery-operated gadgets is limited by the weakest battery in the device. Mixing in an older, weaker battery can cause poor performance and reduced run time even if the other batteries are fresh and new.

A flashlight not shining as brightly or a remote control going dead faster don’t seem so bad, but there’s a bigger potential problem. According to safety materials from the Oak Ridge National Laboratory, mixing old and new batteries or different brands of batteries that have different performance levels causes the stronger battery to compensate for the weaker one, leading to overheating.

Meanwhile, as the weaker battery becomes exhausted, the stronger one can force it to discharge to very low or negative voltage levels, according to Energizer, which increases the chances it will leak.

Friday’s Best Amazon Deals Include Digital Projectors, Ugly Christmas Sweaters, and Speakers

Amazon
Amazon
As a recurring feature, our team combs the web and shares some amazing Amazon deals we’ve turned up. Here’s what caught our eye today, December 4. Mental Floss has affiliate relationships with certain retailers, including Amazon, and may receive a small percentage of any sale. But we only get commission on items you buy and don’t return, so we’re only happy if you’re happy. Good luck deal hunting!

What Are Sugar Plums?

Marten Bjork, Unsplash
Marten Bjork, Unsplash

Thanks to The Nutcracker and "'Twas the Night Before Christmas," sugar plums are a symbol of the holidays. But what are sugar plums, exactly? Like figgy pudding and yuletide, the phrase has become something people say (or sing) at Christmastime without knowing the original meaning. Before it was the subject of fairy dances and storybook dreams, a sugar plum was either a fruitless candy or a not-so-sweet euphemism.

According to The Atlantic, the sugar plums English-speakers ate from the 17th to the 19th century contained mostly sugar and no plums. They were made by pouring liquid sugar over a seed (usually a cardamom or caraway seed) or almond, allowing it to harden, and repeating the process. This candy-making technique was called panning, and it created layers of hard sugar shells. The final product was roughly the size and shape of a plum, which is how it came to be associated with the real fruit.

Before the days of candy factories, these confections could take several days to make. Their labor-intensive production made them a luxury good reserved for special occasions. This may explain how sugar plums got linked to the holidays, and why they were special enough to dance through children's heads on Christmas Eve.

The indulgent treat also became a synonym for anything desirable. This second meaning had taken on darker connotations by the 17th century. A 1608 definition from the Oxford English Dictionary describes a sugar plum as “something very pleasing or agreeable, esp. when given as a sop or bribe.” Having a "mouthful of sugar plums" wasn't necessarily a good thing, either. It meant you said sweet words that may have been insincere.

As true sugar plums have fallen out of fashion, demand for Christmas candy resembling the actual fruit has risen. You can now buy fancy candied plums and plum-flavored gummy candies for the holidays, but if you want something closer to the classic sugar plum, a Jordan almond is the more authentic choice.