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An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

4
votes
Two reasons: One, the battery is old (read: nearly dead) and two, batteries have internal resistance which prevents them from delivering high amounts of current. (Compare to a capacitor, which can deliver very high currents.) …
answered Dec 25 '12 by JYelton
3
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Alkaline batteries, in theory it would last 40.3 hours on Lithium (primary, non-rechargeable), or 20.4 hours on Lithium-ion batteries that occupied the same physical space. If you used a phone battery, it … depends on its size and capacity. Most phone batteries aren't as large as four AA batteries, so you would have to go by the capacity of the battery. Four AA batteries (in series for 6V) have a …
answered Sep 22 '14 by JYelton
2
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Simply put, the premise of your question is faulty in just one word. A battery does not send current, a circuit pulls it. Now for the water analogy! (Sorry, because water analogies fall apart eventua …
answered Aug 30 '14 by JYelton
12
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, it will last a long time. Be aware that batteries (cells, really) have a nonlinear depletion characteristic. Even though milliamp-hours is a finite amount of charge, you must realize that not all …
answered Aug 17 '13 by JYelton
4
votes
Batteries can only supply a given amount of current. You could use an adapter that supplies the same voltage and exceeds the current capacity of the batteries to properly power the device. I would … recommend using a current meter to simply measure what the device uses: Get a 3X AA battery holder, and insert your meter between the batteries and the lamp. Measure with fresh batteries and you will …
answered Feb 10 '13 by JYelton
3
votes
To measure current, you need a multimeter (technically just an ammeter). Some bench multimeters have a graphing or datalogging function which allow you to connect a device and let it run for a while a …
answered Mar 3 '14 by JYelton
1
vote
It depends on how you connect the LEDs. They can't all be connected in series, because that would exceed the 9V you have to work with. You could connect them in parallel with appropriate current-limit …
answered Aug 19 '14 by JYelton
5
votes
Storing alkaline batteries in the refrigerator is not recommended. Manufacturers recommend storing batteries in a cool, dry location, and perhaps some people have taken that to mean "the colder, the … better" — but that's a myth. Energizer, for example, has this excerpt on their do's and don'ts of battery care: DO practice proper battery storage by keeping batteries in a cool, dry place at …
answered Jul 16 '14 by JYelton
12
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Do you know the \$V_f\$ (forward voltage drop) of your LEDs? This is the value you need to know in order to calculate everything else. Fortunately you can determine it by measuring. Connect an LED in …
answered Aug 19 '14 by JYelton
6
votes
The packaging: Shows the product type "Alkaline" in small print twice ("alcalines") and the product "Battery" in large print twice ("Piles"). The second form is in French, making the product bi-li …
answered Nov 25 '13 by JYelton
4
votes
density because of the way in which the separator (salt bridge) is made. This comes at a 10-30% increase in cost, however. It's possible to make flexible batteries with Li-Polymer, and to make them thinner than Li-Ion. Source: http://www.allaboutsymbian.com... …
answered Oct 14 '13 by JYelton
1
vote
LED candles are often a small microcontroller of some sort (to create a flicker effect) and one or more LEDs. Aside from on (flickering) and off, what other cycles or modes do your candles exhibit? Y …
answered Jun 18 '18 by JYelton
5
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If you supplied 5V while the circuit was on a breadboard, and 3.6V while it is on a PCB, that seems to me the biggest explanation of different currents. Having no idea what your circuit is, I'll just …
answered Feb 13 by JYelton
2
votes
This information can be found at various lead acid battery manufacturers, such as Power Sonic. Here is an excerpt from their FAQ: Q: Does overcharging damage batteries? A: As a result of too … little as a few hours. For further information about charging please refer to our Technical Manual pages 12-19. To access our Technical Manual please go to the Literature - SLA Batteries section of our website …
answered Sep 17 '14 by JYelton
5
votes
Batteries connected in series provide the sum of their voltage but at the current of the lowest rated battery. Batteries in parallel (of the same voltage) provide the same voltage as one battery … volumes. However, I will provide calculations based on the highest current draw. "D" cells (batteries) store more energy (18000+ mAh) than "AA" cells (~2750 mAh), and therefore will last longer than …
answered Jul 8 '13 by JYelton

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