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Originally posted by newkid
Luckly I don't buy size D, but I do buy AAA and AA, let me know if they cheating us on those too.
Originally posted by Extralien
If two different sized batteries have the same mAh then why make the sizes different?
You'd think that a bigger battery would have a higher mAh, in theory, yet this is not the case as we're all discovering.
Before we had all these rechargable batteries, the bigger ones did have more power then the small ones.
Originally posted by NuclearPaul
This is not surprising, it's good for business (until it's exposed of course). A car manufacturer I used to work for specifically designed their vehicles to have a lifespan of only 5 years. Why? It's good for business...
For most manufacturers, the perfect scenario requires that you play only MP3s encoded at 128Kbps; you're wearing bundled earbuds; your volume level is at about 50 to 75 percent; the backlight of your screen turns off automatically within 5 to 10 seconds; your equalizer setting is flat or normal; there are no DSP settings (such as the iPod's Sound Check) enabled; you listen to your music in one, maybe two sessions; and if applicable, you don't view any photos or videos. Given that these conditions are rarely ever met in the real world, you'll never achieve the number x in "up to x hours."
Originally posted by thebeard
Is there a way to test the mAh without just running the battery down and timing it? I do have a multimeter around here somewhere...
Effective January 1, 2008, the following rules apply to the spare lithium batteries you carry with you in case the battery in a device runs low: Here are some Points of Lightning. The problem is Lithium is a fire and explosive hazard. It's hard to fight a fire below decks in the cargo area, It's easier to contain in the cabin of an aircraft. Loose Lithium's if jarred or the terminals compromised will burn, oxidize or explode.
To avoid the “memory effect” you should perform a “full recharge cycle”, which is to use you gadget out of its charger until it is operationally discharged (i.e. when you cordless phone starts beeping) and only then recharge it.
# NiCd batteries accept around 500 full recharge cycles.
# NiCd batteries cannot be fully discharged (voltage below 1 V per cell). This damages the battery.
# Don’t short-circuit NiCd batteries or perform any other “quick discharge” trick. This damages the battery (even though several people claim that they can recover NiCd batteries with “memory effect” by doing this). The bottom line is: this kind of trick won’t dissolve the Cadmium crystals, which are responsible for the “memory effect” problem.
# "Zapping" a NiCd battery (high-current quick charge) can solve some dead battery problems, however this technique isn't related to solving the "memory effect" problem.
# When not in use, NiCd batteries lose 1% of their charge per day. After three and a half months, the battery is completely discharged, damaging the battery.
# Don’t expose NiCd batteries to high temperatures.
# Batteries not based on Cadmium do not suffer from “memory effect”.
How’s this for eco-friendly: a battery that runs on sugar. Sony’s bio cell, unveiled in mid-2008, uses glucose-digesting enzymes to extract electrons from any sugary solution (as with other batteries, the electrons flow around the circuit to generate electricity). Connect four of the 50-milliwatt cells, and you’ve got enough juice to keep your MP3 player humming.
Studying batteries involves more than turning on a battery powered device to see how long it runs. Different types and sizes of batteries have widely varying characteristics, so there are many interesting experiments you can perform to make for an excellent science fair project. We'll suggest a number of possibilities for your experiment below.
Originally posted by thebeard
On to the batteries. I checked a universal charger we have at work for batteries and the listed input wattage is 6W or .006kW. In this case, 4 - D batteries take 16.5 hours to charge so 16.5h x .006kw = .099 kWh. My power company charges about $9.10 per kWh so to charge all four D cells would cost me $0.90. That's only about $0.23 per battery charge.
So the final price verdict, for rechargables: $30 initial cost +$230 for 1000 charges = $260
For alkalines you would need to buy about 133 batteries to equal the mAh of 1000 charges so at $5 apiece you would spend about $665.
This thread has shown us just how complex these batteries are and how
easily the public are not told the full story about batteries.