Christmas Leds

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Have alkaline batteries become weaker in the last few years?

I am baffled by a problem I have had with battery-operated Christmas lights I bought about three years ago in the UK.
The two sets of lights are identical. There are about a dozen lights (presumably LEDs) in each set.
When I first bought them they worked fine with two alkaline AA-sized batteries for each set. But their performance was poor with rechargeable batteries.
I have just tried the lights again. About half the lights in each set glow normally. The next few are dimmer than normal and the last few don’t light up at all.
To check them out I tried several lots of alkaline batteries from different brands. With all of them only some of the lights came on.
A friend who is good with electrical things said the problem is that in recent years alkaline batteries have become weaker, because the manufacturers have had to cut out one or more of the chemicals they formerly used (such as lead).
Does anyone know if this is correct? If so, how can I make the lights work normally again???

I can’t find anything conclusive about whether Alkaline capacity has gone down or not. I couldn’t find anyone who’s done any testing online showing that alkalines now have lower capacity than they used two.
My guess is that this is more a problem with your LED lights than the batteries, although I don’t know what happened to them. I thought LED’s were supposed to be pretty stable.
You could try special high-capacity batteries, like Energizer Titaniums or Panasonic Oxyrides, but this probably isn’t the right application for them, as they’re geared towards high drain devices, and actually provide lower amp hours than alkalines in low drain. The failure of the bulbs to light up shouldn’t be because they can’t draw enough amps, because any of these batteries, when new, should provide plenty of juice to run the LED’s.
If there’s a battery problem, my guess would be that your battery voltage isn’t high enough. There’s one clear thing to try in that case: buy lithium batteries and see how they do. Lithium batteries run at higher voltages and last about twice as long as alkalines. For AA’s:

Alkalines: about 2850 mAh for a 20-hour drain. 1.5 V.
NiMH: about 2,000 mAH for a slow drain, but actually much better than alkaline (twice as many Ah) for high drain. 1.25V
Lithium: 4000 mAh for high or low drain, 1.7 V.

So you might give the lithiums a shot.

Good luck.

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UZO1 Illuminated / Lighted Party Beverage Fountain (Punch Bowl), Operates on both Electric and Batteries for Outdoor Use, 2 Gal Capacity $45.99 Ideal for birthday parties, weddings, and other special events, this fountain holds up to 2 gallon of any favorite beverage and features a three-tier cascading tower. The unit pumps liquid from the lighted bottom bowl up to the top. The beverage then cascades back down in a waterfall effect from one tier to the next through holes around the outside of the bowls. For added effect, the fountain chan…

Light-up Ice Cubes, Pack of 12 $23.69 Tap on – Tap off. Glowing ice cubes. Great for parties, restaurants, night clubs, punch bowls, and those intimate times. Non-toxic. Hand wash with hot, soapy water before using (not dishwasher safe). Freeze if desired. For maximum drink-cooling power, use in combination with real ice. Ages 3 and up….

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Live Aid (4 Disc Set) $24.99 Billed as “the day music changed history,” the Live Aid concerts of July 13, 1985, were held to raise money to fight the horrifying famines sweeping Africa. The brainchild of Bob Geldof and representing the efforts of countless musicians and technicians, Live Aid was a genuine and inspiring effort to help the victims of an overwhelming calamity. Twenty years after the twin concerts (one in London,…

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Belkin Conserve Socket F7C009q Energy-Saving Outlet $9.66 Conserve Socket Power Timer. Many of the electronics and appliances around your home use electricity even when they’re not in use wasting energy and driving up your electric bill. The Conserve Socket Power Timer automatically shuts off power (including standby power) to your electronics and appliances after a time interval you select to help you save energy. Choose between three settings: 30 minut…

100-Count Clear Christmas Light Set $9.29 Ideal for both indoor and outdoor use, this 100-count clear mini-light set features green wire, 18″ lead wire, and 3″ end connector. If one bulb goes out, the others remain lit. Three sets of lights can be connected together. Includes 2 flasher bulbs, 2 extra bulbs and 1 replacement fuse….

Multi-Color E27 LED Light Bulb with Remote $4.00 Light-emitting diodes are darn cool and have found uses in so many places – traffic lights, standard lightbulb sockets and high-powered flashlights to name a few. The Multi-Color LED Lightbulb is a super bright LED bulb that can transition through dozens of color and rightness combinations and is compatible with a standard lightbulb socket. The included IR remote can select an individual color or …