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[TW] The Best Rechargeable AA Batteries [BENCHMARKS AND TESTS] - Page 3

post #21 of 40
Have a set of two or three year old Duracell rechargeable, use them for my Spektrum DX4C transmitter for my hobby grade RCs.
Little lower voltage than standard cells, but being able to recharge these and keep them for a long time is a HUGE positive!

Originally was using them in a Logitech G700 and they were flawless then as well.
post #22 of 40
I"ve always wanted to buy a pack of eneloop but can't find any electronics in my home to justify the need.
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post #23 of 40
Quote:
Originally Posted by CynicalUnicorn View Post

Is that really necessary? I know lead-acid batteries need to be charged and used, or else the acid will eat away at the lead and destroy the battery, but I'm not aware of other battery chemistries that need that.

There is no such thing as a battery with no memory. Modern batteries are largely resistant, but still susceptible if you're consistent enough at draining to a certain point. I have yet to read instructions for battery care that don't recommend fully discharging the battery on a regular basis (usually once a month, of course I practically never do, but I never use my laptop unplugged either).
post #24 of 40
It seems they only tested up to 1 amp discharge rate. I'd like to see 2-5 amp discharge curves for those energizers. I've always used eneloop pros in my high discharge rate devices.
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post #25 of 40
I ordered a bunch of the new eneloops back in September. Loving them. Back when the original Wii first came out, I bought a ton of Duracell rechargeable's and the 15 minute quick charger. They worked great for years but that quick charger I'm sure is what eventually killed them off. They were 2800mah as well.
   
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post #26 of 40
Yeah, batteries don't like heat. Charging speed is going to be directly related to current. As current increases, so too does waste heat.

It would probably be a smarter idea to have a good, slow charger with fully charged batteries ready to go.
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post #27 of 40
Thread Starter 
Quote:
Originally Posted by CynicalUnicorn View Post

Yeah, batteries don't like heat. Charging speed is going to be directly related to current. As current increases, so too does waste heat.

It would probably be a smarter idea to have a good, slow charger with fully charged batteries ready to go.

The standard Eneloop charger is pretty great for that.

My batteries take 6-8 hours to fully charge from being totally dead.
post #28 of 40
Quote:
Originally Posted by CynicalUnicorn View Post

I know lead-acid batteries need to be charged and used, or else the acid will eat away at the lead and destroy the battery, but I'm not aware of other battery chemistries that need that.

Lead acid batteries suffer from sulfation when not fully charged. The lead isn't eaten by the acid. The amorphous lead sulfate that is normal during use migrates to the anode and hardens into stable crystals. These crystals decrease capacity and can eventually physically damage a cell if left to grow large enough. Think tree root versus concrete.
post #29 of 40
Quote:
Originally Posted by CynicalUnicorn View Post

Yeah, batteries don't like heat. Charging speed is going to be directly related to current. As current increases, so too does waste heat.

It would probably be a smarter idea to have a good, slow charger with fully charged batteries ready to go.

I was cheap, and playing a lot of games, so every battery was being used (especially with all my wii motes) so if one would die, waiting 15 minutes was not an issue. And again, they lasted for nearly 5 years before dying off.

My eneloops came with the Pansonic advanced battery charger that works great.
   
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post #30 of 40
Quote:
Originally Posted by CynicalUnicorn View Post

...
Quote:
Originally Posted by Lady Fitzgerald View Post

The earlier Eneloops would hold a usable charge for at least a year when not being used. The newer ones will hold the charge even longer. I only charge batteries after I deplete them and also once a year, whether they need it or not. As I mentioned before, I have some Eneloops that are almost seven years old, are still going strong, and none have ever died. I suspect I will never have to buy another one for the rest of my life unless I get more "toys" that need them.

Is that really necessary? I know lead-acid batteries need to be charged and used, or else the acid will eat away at the lead and destroy the battery, but I'm not aware of other battery chemistries that need that.

Yes and no. The LSD Ni-MH batteries do not need to be kept charged and used to keep them from failing but they will eventually lose their charge. The Eneloops have a curious discharge curve. Even when setting unused, they will loose voltage during the first month or so, dropping down to around 3.5v (depending on the age of the battery). After that, when unused, they will pretty much hold that voltage for at least a year (they newer ones will go well beyond a year) before finally losing enough power to self-discharge enough for the voltage to start to plummet (curiously enough, Eneloops in use will show the same discharge curve, only accelerated). While idle Eneloops will still be showing a charge of around 3.5v after a year or more, they will not be able to deliver their full capacity since part of it has leaked away. I keep quite a few spares on hand so when a battery (or set of batteries) runs down, I can just pop in spares and recharge the discharged batteries later when it is convenient for me. By recharging all the batteries at the same time once a year, I ensure all my spares have pretty much a full charge on them and I won't have to swap them out as often. Since the life of these batteries is measured in recharge cycles and the standard life of the Eneloops is a minimum of around 1000 cycles, my recharging them yearly will not measurably reduce their life and will ensure that when I pop a spare into a device, it will perform for a reasonable amount of time.
     
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