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Selecting the right battery

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Sanjib.A
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re: Selecting the right battery
Sanjib.A   6/19/2012 5:21:46 PM
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This is a very nice overview of the different battery technologies. What does the "efficiency" in the table providing a summary of the different types of batteries indicate? Efficiency of charging-discharging?

katgod
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re: Selecting the right battery
katgod   6/20/2012 4:52:41 PM
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Good question and based on the numbers I think your guess of charge - discharge is a good one.

old account Frank Eory
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re: Selecting the right battery
old account Frank Eory   6/19/2012 8:19:51 PM
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Good article, but the material seems a bit dated. NiCd is in steep decline -- are those batteries even allowed in Europe anymore? And NiMH has mostly been superseded by Lithium ion for nearly all consumer portable applications.

Hughston
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re: Selecting the right battery
Hughston   6/21/2012 4:24:10 PM
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I thought Europe banned them in the mid 90s for environmental reasons.

SimulinkJocky
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SimulinkJocky   6/20/2012 1:01:25 PM
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There is quite a lot of information out there pointing out that the real NICAD memory effect is largely gone in modern designs. Damage from overcharging is NOT the memory effect. The use of a smart charger for both NI-MH and NICAD can eliminate overcharging. I hope you're going to go into that next week.

docdivakar
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re: Selecting the right battery
docdivakar   6/20/2012 7:58:25 PM
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@Frank Eory & IFindNickNamesAnnoying: you are both correct, NiCd have been phased out in EU countries now, under the "batteries directive" the sale of except for medical use, alarm systems, emergency lighting, and portable power tools. This last category is to be reviewed soon. In the US, part of the battery price charged goes toward recycling. But we all know many states are lacking in recycling e-wastes and consumers are also complicit in adhering to recycling. MP Divakar

Erny48
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re: Selecting the right battery
Erny48   6/21/2012 6:31:29 AM
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A good article, but shouldn't it include Lithium Iron Phosphate batteries, they seem to be the rising chemistry for a lot of applications?

Nexing
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re: Selecting the right battery
Nexing   6/21/2012 11:18:49 AM
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Another vote for the Lithium Phosphate LiFePO4 and LiPO

docdivakar
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re: Selecting the right battery
docdivakar   6/20/2012 8:03:55 PM
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@afpele: I am also looking forward to part 2 of this article. Continuing in a similar theme, it would be nice to have a writeup on printed battery technology and their maturity to be deployed in end products in low power applications. MP Divakar

elctrnx_lyf
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re: Selecting the right battery
elctrnx_lyf   6/21/2012 8:51:36 AM
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Li-Ion and more advanced technologies are already overtaking many applications of NiMH and NiCd also.

Nexing
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re: Selecting the right battery
Nexing   6/21/2012 11:32:18 AM
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Amazingly this article -so far- misses what probably is the most needed information; How user's usage, 1st charge and charging practices vary accordingly different battery types. At 2012 most users have yet to learn that lithium ion batteries are best not discharged below 20-30% capacity, very different from the NiMH requirement of full discharge...

Hughston
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re: Selecting the right battery
Hughston   6/21/2012 4:57:10 PM
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Why do you leave that much reserve capacity in the battery? Is it to extend battery life? Is it because the internal impedance goes up too much? I remember when the voltage gets down near 3V, the battery is going fast.

Nexing
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re: Selecting the right battery
Nexing   7/5/2012 3:30:10 AM
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http://blog.bestlaptopbattery.co.uk/876/ Look at the inverse correlation between the level of Depth Discharge and discharging cycles at that article. Besides, part II of this article finally did not answered most questions left unresolved here. This link http://blog.bestlaptopbattery.co.uk/ might prove to be more useful than what we are commenting into.

Hughston
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re: Selecting the right battery
Hughston   6/21/2012 4:52:12 PM
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Here are a few other good characteristics of lithium ion batteries: flat discharge curve, typical voltage just about right to linear regulate for logic, and it's easy to detect charge termination. Low self discharge is important for many low power applications. You don't have to use CC/CV charge methods for these batteries. You can pulse charge them.

Mike K.
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re: Selecting the right battery
Mike K.   6/25/2012 7:32:22 PM
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As mentioned above there are regulatory requirements to consider when selecting a battery technology. There are issues with batteries based on cadmium, lead, and lithium (and mercury, of course) in a variety of markets, not just the EU. Some are environmental, some are transport-related. If you're going to do an article about "Selecting the right battery" in 2012, consideration of environmental performance, recyclability, potential shipping constraints, and legality are of critical importance.

Hughston
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re: Selecting the right battery
Hughston   7/9/2012 3:38:55 PM
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I was looking at my neighbor's outdoor solar lights last night and I was surprised to see NiCad batteries in what is supposed to be a green product. I assume they have the cheapest charging method, which would be trickle charge.

Mike K.
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re: Selecting the right battery
Mike K.   7/9/2012 7:20:42 PM
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Hah! Who said solar anything is "green"? Most solar cells use Cd in the elements too. They lobbied for, and received, an exemption from the scope of EU RoHS.

mcjw
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re: Selecting the right battery
mcjw   6/27/2012 12:29:02 AM
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I was expecting to see what the difference is between 1000-cycle Li-ion and 300-cycle Li-ion, in cost, technology, and design. Since many products have internal batteries, this is important.

Tim Foo
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re: Selecting the right battery
Tim Foo   6/27/2012 1:41:20 PM
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The focus of the aricle is on recharable batteries. There is a whole peletora of non-rechable batteries that are available off-the shelf. These includes: Carbon Zinc 1.5V Alkaline Manganese 1.5V Lithium Iron Disulphide 1.5V, long shelf life, high power density Lithium Manganese 3V, long shelf life, high power density Lithium Thionyl Chloride 3.6V, long shelf life, very high power density Silver Oxide 1.5V, typically button cells only

anne-francoise.pele
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re: Selecting the right battery
anne-francoise.pele   7/16/2012 3:25:01 PM
I invite you all to look for Part 2 next week. It will explain how to implement a battery charger using Li-Ion technology as the example.

anne-francoise.pele
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re: Selecting the right battery
anne-francoise.pele   7/16/2012 3:25:01 PM
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Part Two of this two-part article is now available here: http://www.eetimes.com/design/smart-energy-design/4376071/Implementing-battery-charger-using-Li-ion?Ecosystem=smart-energy-design

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