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Started By
Message
anyone ever tried rechargeable lithium AA batteries?
Posted on 9/5/14 at 6:28 am
Posted on 9/5/14 at 6:28 am
Do they make such a thing? My limited Google searching this am is inconclusive so far.
Seems to be steering me to either lithium AA.. Or rechargeable AA.. But not both.
Seems to be steering me to either lithium AA.. Or rechargeable AA.. But not both.
Posted on 9/5/14 at 7:34 am to CAD703X
pretty much the same batteries used in cell phones, laptops or other rechargeable things
Posted on 9/5/14 at 8:00 am to LEASTBAY
I've never heard of a phone using lithium AA batteries
Posted on 9/5/14 at 9:07 am to CAD703X
search for lithium-ion AA. full page of links to rechargeables.
Posted on 9/5/14 at 9:11 am to CAD703X
The big name manufacturers want you to keep buying disposables.
Posted on 9/5/14 at 9:41 am to mchias1
quote:
search for lithium-ion AA. full page of links to rechargeables.
o rly?
other than some off brands on ebay..where are they?
all i see at amazon is regular lithium AA..and one hit for a 'dulex' brand with only one review.
shouldn't these things be all over the place??
it seems like a no-brainer LiON rechargeable is the way to go.
Posted on 9/5/14 at 9:47 am to CAD703X
It is because of the voltage, lithium batteries typically run at a higher voltage than AA which will damage electronics that use AA.
Posted on 9/5/14 at 9:49 am to CAD703X
eta, ok finally found what i *think* is the answer.
kind of long-winded but apparently there are some 'technical difficulties' that make LiON ill-suited as a generic AA replacement. In some cases LiON rechargeable actually don't last as long as a NiMH rechargeable.
Any rechargeable LiON you see on ebay is suspect and probably not what you're thinking it will be.
kind of long-winded but apparently there are some 'technical difficulties' that make LiON ill-suited as a generic AA replacement. In some cases LiON rechargeable actually don't last as long as a NiMH rechargeable.
Any rechargeable LiON you see on ebay is suspect and probably not what you're thinking it will be.
quote:
A system designed to run from a 1.5 Volt source (SMqV) will handle input voltages from about 2 Volts down to 0.8 Volts This is in order to suck the last dregs of power from a dying alkaline battery. A rechargeable Li-Ion will come off the charger at about 4.2 Volts. This says the switching power supply now has to handle a 5.4 ratio of input voltages (4.2 divided by 0.8). It can be done, but efficiency of the switcher suffers. A common voltage for DSPs and other digital stuff is 3.3 Volts. With a nominal 1.5 Volt battery, you are always running as a step up switcher (boost switcher). If you have a higher input voltage than 3.3 Volts, such as the 12 Volt external input on some gear, you need a step down switcher (buck switcher). This means the designer only has to worry about one type of supply. The topology of the step up and step down devices is totally different. The problem with a 4.2 Volt battery is that now you need a switcher that steps the voltage down to 3.3 Volts for most of the Li-Ion battery life but with an alkaline or other 1.5 Volt battery, you need the same switcher to step up to 3.3 Volts.
There are setups that will handle both but they add complexity and worse, are not as efficient. Taking half an hour to an hour out an SMv's battery life is not a way to be popular.
Finally, since the power/volume density of a NiMh is very close to that of Li-Ion battery, there really is no good reason to design for a Li-Ion battery that is hard to find in the middle of the Amazon, let alone Walmart. (Alkaline and NiMh AA's are ubiquitous.) For the power/volume numbers, the power of a NiMh is 2.5Ah times 1.2 Volts or 3 Watt-Hr. The 14500 Li_Ion rechargeable is 3.6 Volts times 0.8Ah or 2.9 Watt-hr, pretty much equal numbers. Where the Li-Ion has a big advantage, is in weight. The power/weight density is much better at about half the weight of NiMh battery for equivalent energy storage. This is very important in cars where Li-Ion battery weight can be 25% of the mass of the car (Tesla).
So, hard to find in an emergency, same power level as NiMh, complicates power supply design ($$) and reduces run time in general. Keep in mind this discussion is for AA size batteries. Obviously Li-Ion is very successful in many devices, most of which are permanently installed (cell phones) and sized mechanically to fit a particular, one off package. Being able to remove the protective can from a battery as in a flat pack battery for phones is a huge advantage for Li-Ion, one that the spiral structure of a NiMh does not enjoy.
Posted on 9/5/14 at 9:49 am to surprisewitness
beat me to it. i figured there had to be a problem here or these would be all over the place.
Posted on 9/5/14 at 9:54 am to CAD703X
I just use eneloops in everything that needs AA or AAA
Posted on 9/5/14 at 9:56 am to CAD703X
yea, my bad. for some reason i had forgot about NiCd and just assume NiMh was the crappier version. i thought my rechargeables were Li-ion and not NiMh. Also, assumed since almost everything else used Li-ion that there were AA sizes of them.
Posted on 9/5/14 at 10:01 am to surprisewitness
quote:
I just use eneloops in everything that needs AA or AAA
This. Love these batteries! They come charged and hold a charge when dormant forever!
Every remote in my house has eneloop batteries in them. More than paid for themselves just in the Xbox and Wii controllers alone.
Posted on 9/5/14 at 10:03 am to mchias1
quote:
Also, assumed since almost everything else used Li-ion that there were AA sizes of them.
my thoughts exactly..my son's new nikon camera uses 4 AA alkalines and eats them like chicklets so i thought why don't i find him some rechargeable LiONs?
the thing i dont get..is that they sell NON-RECHARGEABLE AA LiONs. i guess its the recharge factor that's the problem. seems like a solvable problem for someone.
Posted on 9/5/14 at 2:32 pm to Jimbeaux28
quote:
More than paid for themselves just in the Xbox and Wii controllers alone.
yep, this reminds me i need to order some more.
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