USB Batteries 248
An anonymous reader writes "Tired of paying for new batteries all the time? Tired of searching for the charger for your rechargeable batteries? Worry not, because these new AA batteries will recharge direct from your USB port! This is such a cool idea, that I cant believe that no one has done it before." At $24 each I would hate to lose or break them on a regular basis.
Not so fast... (Score:5, Informative)
Let's break this down.
4 batteries - $6 at Walmart for off brand or $10 - $15 for 4 name brand rechargables.
Cheap AA/AAA USB Charger $8 from tiger direct. [tigerdirect.com]
OR
Better AA/AAA USB Charger $20 from tiger direct. [tigerdirect.com]
The cheapest route gives you 4 batteries, each with twice the mAH for $14 plus shipping. The most expensive route gives you the same thing for $30 plus shipping. Either way, buying a battery with only 1300 mAH nowadays is like buying a midsized car with a 50 hp engine.
Bottom line? For novelty reasons, these batteries look interesting and you do not need to carry an additional charger. But at around $16 US apiece they are expensive and WAY underpowered. Additionally, you need one USB slot for each. If you buy a regular USB charger and use standard rechargeable batteries, you can charge several (up to 4) with one USB slot and spend half the money.
Conclusion? It's a neat novelty backup backup. But it is way to expensive.
Re:$12? Where is this from? (Score:4, Informative)
Not really new... (Score:5, Informative)
Not all AAs are created equal (Score:2, Informative)
In the last couple years they've dropped rechargeables to 1.2V which means normal batteries are delivering 25% more power if the amps stay the same. I don't want 'em.
1300 maH? (Score:5, Informative)
You don't have to worry about charging on a USB port if your batteries don't die all of the time.
Nope, still not of any use... (Score:4, Informative)
"Uh, yeah, couldn't I just have used a regular battery that wouldn't be dead yet?"
You can have:
- an expensive, dead, 1300 mAh USB battery that you need to recharge on your laptop (good luck on your laptop battery not going dead first!)
- a cheap, half-full 2500 mAh regular rechargable battery that you don't need to recharge at all.
Re:Not all AAs are created equal (Score:4, Informative)
Anyway, alkalines are only 1.5V out of the box. When they're "dead", they're at around 0.6V, and it's a fairly linear decline over time. In fact, electronics made to run on alkalines are generally fine down to around 0.9V or so, since the decline is expected.
NiMHs and NiCads are ~1.2V after a charge, and stay there until just before they die, when they nosedive. This is why cameras recommend non-alkaline batteries--the flash actually requires that the voltage is somewhere around the maximum; alkaline batteries drop voltage so quickly that the flash only works a relatively small number of times.
It's about the chemistry (Score:5, Informative)
Re:Yep...and... (Score:2, Informative)
It's a triband cellphone, palm OS5, blue-tooth enabled, MMC/SD card, all in one thingie.
With pocket-tunes it an MP3 player (mp3, ogg, flac), with TCMPMP you can watch the simpsond on a plane,
heck you can even use it as an GPS navigation system over bluetooth.
Runs VNC and SSH too if you want.
It can do just about anything you can throw at it.
But, the build in camera is real crap though, don't even think about making a decent picture with it.
Re:Yep...and... (Score:2, Informative)