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Micro battery charger


spacifique1

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  • 1 month later...

Hi Prateek,
You spell spacific like a blue-blooded Frenchman!
Check-out www.energizer.com and click on Technical Info. They have tiny button and coin shaped battery cells, some that use lithium. They have a shelf life of at least 10 years and pack a lot of lightweight endurance.
They also have expensive AA size lithium cells (1.5V, most other lithium cells are 3V) that have a very flat voltage over their life and they claim they can take many times more digital pictures than alkaline cells. ;D
 

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HI AUDIOGURU!
A BOOK ON PHYSICS BY "RESNICK AND HALLIDAY" SHOWS A CAPACITOR BEING USED IN A MEDICAL DEFEBRILLATOR BY A DOCTOR AND THEN IT EXPLAINS ITS ANALOGY WITH THE SPRING.HOW IS A CAPACITOR DIFFERENT FROM A BATTERY IN OPERATION?
(MORE SPECIFICALLY A RECHARGEABLE BATTERY)
CAN IT REPLACE A CAPACITOR IN CIRCUITS?
::)
PRATEEK

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Hi Prateek,
The choice of using a rechargable battery or super-capacitor (many Farads) depends on their strengths and weaknesses:
1) I have some 1W walkie-talkies that use three rechargable AAA Ni-Cads. Each charge powers them for about 6 hours if I don't transmit much. For the small size and weight of the battery it has a lot of power/endurance. But if I charge them then don't use them for a few months, the batteries are dead and needing a recharge due to self-discharge.
2) I have a telephone answering machine and other items with super-capacitors that hold their charge and therefore power the low-current memory for a very long time. But I don't expect the 1.0 Farad capacitor to power my walkie-talkie for longer than a few seconds.
3) I use rechargable Ni-Cad and Ni-MH batteries in flashlights. They stay bright until the end of the charge because the batteries have a very flat voltage during discharge. I wouldn't use a re-chargable battery as the capacitor in a timer circuit where the time period is determined by the reduced voltage of the capacitor as it sharply drops during discharge. ;D 

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