Eveready Case
Batteries: what’s the difference?
I have Eveready batteries for electronic application, they come in different voltages like 15, 22.5 ets. What is the difference from regular 9 V duracell batteries, besides the voltage?
I need an 18 V DC source for 3mA current that would last for a long time. I know I could always experiment. I’m asking cause it’s critical in my case that it won’t die – a lot of stuff stops working and irreversible changes happen.
Can I assume that a larger (in physical size) battery will last longer?
Wow, didn’t expect such detailed answers. Long time is 8 months. I don’t have space or weight limitations. Well, I don’t want it to be, say, more than 5 lbs.
Cirquit will stop working at 15 V. I don’t want to exceed 20 V.
Batteries typically have two ratings. The voltage is easy to find. But sometimes you need to do some detective work to find the amp-hour rating.
A typical Duracell 9 V alkaline battery is rated for 580 milliamp-hours. Two batteries in series provide 18 volts at 580 milliamp-hours. At 3 milliamps, the batteries will last up to 193 hours at most. (probably less)
Your question is missing details of your requirements:
- How long is “a long time”?
- Do you have physical dimension or weight limitations?
If the second answer is “no”, perhaps you’d want to consider wiring three 6 V lantern batteries in series. They’re pretty big, but a standard Duracell 6 volt lantern battery has a capacity of 13 amp-hours. Three in series will provide 18 volts with 13,000 milliamp-hours. That’s 22 times the capacity of the original two 9 V batteries.
In theory, your 3 mA load should operate for 13,000 ÷ 3 = 4333 hours. That’s probably a bit optimistic, but even derating that by 20% still provides nearly 3500 hours.
I doubt the battery will hold a decent voltage near its “end of life”. Depending on how voltage sensitive your equipment is, low voltage will probably cause the electronics to stop working before you drain the last amp-hours out of the battery.
>>>>> Update <<<<<
I weighed a 6 V lantern battery I had laying around. It weighs 0.602 kg. Three of these would weigh 1.806 kg or just under 4 lbs.
Another item to consider is the ambient temperature where your equipment will be operating. Hot temperatures kill batteries. Cold temperatures reduce the battery capacity. If your experiment is going to be exposed to temperatures over 90° F or below freezing, consider insulating the battery compartment.
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CASE 48 NEW Eveready Energizer AAA Alkaline Batteries !! $20.85 |
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