Sunday, February 17, 2008
More of the extremely helpful weekly tips from all-battery.com follow... to visit their website just click on the link in our right-hand margin...
Question...
"Are Lithium Ion batteries available in standard sizes like AA, AA, C or D cell size?"
Answer...
"No, Lithium-ion batteries are not available in standard sizes. We believe this is because it would be too easy for users to inadvertently put them in a charger not designed for Lithium-ion batteries creating a potentially dangerous situation.(If an alkaline battery is put into the wrong charger it might leak or even burst, but a lithium-ion battery put into a NiCd or NiMH charger not designed for lithium-ion, might ignite. Also, because Li-ion batteries operate at much higher voltage (typically 3.7V per cell) than the 1.2 to 1.5V of most cell batteries, designing a 1.5V lithium-ion cell would be expensive."
Next question...
"If my camera (or other electronic device) uses NiMH or NiCd batteries can I use Lithium Ion batteries?"
Answer...
"Normally you can not switch between a NiMH or NiCd battery and a lithium ion battery in a digital camera. There are some devices specifically designed to use either type of battery, cell phones are the most common example. If you can use either type of battery, it should say so in the User's Manual."
Question...
"Are Lithium Ion batteries available in standard sizes like AA, AA, C or D cell size?"
Answer...
"No, Lithium-ion batteries are not available in standard sizes. We believe this is because it would be too easy for users to inadvertently put them in a charger not designed for Lithium-ion batteries creating a potentially dangerous situation.(If an alkaline battery is put into the wrong charger it might leak or even burst, but a lithium-ion battery put into a NiCd or NiMH charger not designed for lithium-ion, might ignite. Also, because Li-ion batteries operate at much higher voltage (typically 3.7V per cell) than the 1.2 to 1.5V of most cell batteries, designing a 1.5V lithium-ion cell would be expensive."
Next question...
"If my camera (or other electronic device) uses NiMH or NiCd batteries can I use Lithium Ion batteries?"
Answer...
"Normally you can not switch between a NiMH or NiCd battery and a lithium ion battery in a digital camera. There are some devices specifically designed to use either type of battery, cell phones are the most common example. If you can use either type of battery, it should say so in the User's Manual."
Special offers...
All-Battery.com have a new CBA II battery tester and analyzer arriving at their warehouse today.
This new battery analyzer has all of the features like those 'couple of thousand dollar' battery testers.
To check out this CBA II Computerized Battery Tester and Analyzer -- up to 120A/500Watts -- just click all-battery.com (USA)
SPECIAL Low Price during the sale... also try quoting special2137 to see if a further discount is still available [sorry, it may have gone by the time you read this]!
This new battery analyzer has all of the features like those 'couple of thousand dollar' battery testers.
To check out this CBA II Computerized Battery Tester and Analyzer -- up to 120A/500Watts -- just click all-battery.com (USA)
SPECIAL Low Price during the sale... also try quoting special2137 to see if a further discount is still available [sorry, it may have gone by the time you read this]!
Labels: battery analyzer, battery testers
Friday, February 08, 2008
News from our UK supplier...
If you click over to our UK supplier [the link is in our right-hand margin] you will find a link at the top right-hand side of their home page which says 'News' - there you will find all their latest news stories including the following...
"New guide to caring for cyclic batteries...
MDS Battery has published a new guide to looking after cyclic batteries used in mobility scooters and various other applications" - check their website for the rest of the news and information.
"New guide to caring for cyclic batteries...
MDS Battery has published a new guide to looking after cyclic batteries used in mobility scooters and various other applications" - check their website for the rest of the news and information.
Weekly tips from all-battery
All-battery supply a brilliant, and extremely informative weekly email... below I have quoted from the email their answer to 'What is the Frequency dependence of Batteries?'
So, if you require the answer to this query, you can take it from the experts! I quote...
"There are three frequency regimes to consider when dealing with batteries:
1. Ultra low frequencies. These are frequencies measured in inverse hours or days. In this regime the battery acts like you would expect it to. At low frequency a battery will act like a current source plus resistance. All of the energy transfer will be due to ion movement through the electrolyte and none will be due to surface charge or capacitive storage.
2. Medium frequencies, 1kHz to 1 Hz you are dealing in the regime of ion movement. If you are trying to pull a 10 mSec pulse out of a battery you will be accessing surface charge and capacitive storage, but also charge due to charges moving across the electrolyte. By the induced charge theorem a charged particle doesn't’t need to move all the way across from one electrode to another to realize this energy, an ion with a charge of one unit will induce a charge on the anode of 1/10 of a unit as it moves 1/10th of the distance from the cathode to the anode. But these ions move slowly compared to the electrons in a wire, and this shows up as an increased resistance. The shorter the pulse and the higher current drawn the more the internal resistance of the cell will show itself.
3. High frequencies for batteries are above 1kHz. In this regime impedance is a better term than resistance because capacitance and inductance come to play. Many types of batteries are spiral wound, which introduces more inductance than flat plates would, and of course all batteries are capacitors, having parallel plates separated by a distance. If the current is drawn from the battery in a series of short pulses at high frequency strange things can happen. For example you can get crazy oscillations in a feedback situation such as a switching power supply. In these kind of applications a capacitor across the battery lets the battery move into a lower frequency regime."
So, if you require the answer to this query, you can take it from the experts! I quote...
"There are three frequency regimes to consider when dealing with batteries:
1. Ultra low frequencies. These are frequencies measured in inverse hours or days. In this regime the battery acts like you would expect it to. At low frequency a battery will act like a current source plus resistance. All of the energy transfer will be due to ion movement through the electrolyte and none will be due to surface charge or capacitive storage.
2. Medium frequencies, 1kHz to 1 Hz you are dealing in the regime of ion movement. If you are trying to pull a 10 mSec pulse out of a battery you will be accessing surface charge and capacitive storage, but also charge due to charges moving across the electrolyte. By the induced charge theorem a charged particle doesn't’t need to move all the way across from one electrode to another to realize this energy, an ion with a charge of one unit will induce a charge on the anode of 1/10 of a unit as it moves 1/10th of the distance from the cathode to the anode. But these ions move slowly compared to the electrons in a wire, and this shows up as an increased resistance. The shorter the pulse and the higher current drawn the more the internal resistance of the cell will show itself.
3. High frequencies for batteries are above 1kHz. In this regime impedance is a better term than resistance because capacitance and inductance come to play. Many types of batteries are spiral wound, which introduces more inductance than flat plates would, and of course all batteries are capacitors, having parallel plates separated by a distance. If the current is drawn from the battery in a series of short pulses at high frequency strange things can happen. For example you can get crazy oscillations in a feedback situation such as a switching power supply. In these kind of applications a capacitor across the battery lets the battery move into a lower frequency regime."
Labels: capacitors, high frequencies, medium frequencies, oscillations, ultra low frequencies
NEW Batteries
This week, the new Ready to Use NiMH battery is arriving at the 'all-battery.com' warehouse.
This is an exciting development, check them out now... just click on the link to 'all-battery' in our right-hand margin.
This new NiMH battery is a combination of a rechargeable and a disposable battery, the next evolutionary step for batteries into the 21st century.
This is an exciting development, check them out now... just click on the link to 'all-battery' in our right-hand margin.
This new NiMH battery is a combination of a rechargeable and a disposable battery, the next evolutionary step for batteries into the 21st century.
Labels: evolutionary step for batteries, NiMH battery charger, rechargeable and disposable battery combination
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