Hi capacity rechargeable AA Batteries?

[Bob Masta]

On Thu, 24 Mar 2011 16:12:36 -0400, Michael Black
<et472@ncf.ca> wrote:

<snip>

But then I measured the voltage after one charge (in a quickcharger) and
the voltage was lower than I expected. Joined with the likelihood that
the radio has some cutoff that isn't intended for non-alkaline batteries,
and it's not really a surprise.

I had an old digital camera that took 4 AA cells, and was
apparently designed for alkalines to get 4 x 1.5 = 6 volts.
But with 4 x 1.2V rechargeables it only got 4.8V right at
the start, and went downhill from there. I kept thinking
about ways to add a holder for a 5th battery to get 5 x 1.2
= 6V, but the camera died a permanent death before I got
around to it.

Best regards,



Bob Masta

DAQARTA v6.00
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, FREE Signal Generator
Pitch Track, Pitch-to-MIDI
Science with your sound card!

 

[Bill Bowden]

On Mar 25, 4:19 am, N0S...@daqarta.com (Bob Masta) wrote:

On Thu, 24 Mar 2011 16:12:36 -0400, Michael Black

et...@ncf.ca> wrote:

snip

But then I measured the voltage after one charge (in a quickcharger) and
the voltage was lower than I expected.  Joined with the likelihood that
the radio has some cutoff that isn't intended for non-alkaline batteries,
and it's not really a surprise.

I had an old digital camera that took 4 AA cells, and was
apparently designed for alkalines to get 4 x 1.5 = 6 volts.
But with 4 x 1.2V rechargeables it only got 4.8V right at
the start, and went downhill from there.  I kept thinking
about ways to add a holder for a 5th battery to get 5 x 1.2
= 6V, but the camera died a permanent death before I got
around to it.    

Best regards,

Bob Masta

              DAQARTA  v6.00
   Data AcQuisition And Real-Time Analysis
             www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
           Pitch Track, Pitch-to-MIDI
          Science with your sound card!

I see some new nickel-zinc AA rechargeables that operate at 1.6 volts
and have a peak charge a little greater. I tested a couple that
measure 1100maH. Downside is greater self-discharge and only 200
cycles compared to 500 for NiMH. About $10 for a package of 4. Here's
a review:

http://www.amazon.com/PowerGenix-PGX-4AAZiNc-1-6v-Voltage-Rechargeable-Batteries/dp/B0029LHXG2

-Bill

 

[Bob F]

Bill Bowden wrote:

On Mar 16, 3:40 pm, Bill Bowden <bper...@bowdenshobbycircuits.info
wrote:
On Mar 16, 10:52 am, asdf <a...@nospam.com> wrote:



On Tue, 15 Mar 2011 22:41:03 -0700, Bill Bowden wrote:
I see numerous offers for rechargeable AA batteries on Ebay. I
bought a set of 4 advertised at 2500 maH, but turned out to be
only about 400maH at a 330 mA load in my digital camera. The
batteries powered the camera for about 1.2 hours at 330mA in the
slide show mode, which amounted to only 0.330 * 1.2 = 396 maH.

They probably are some 15 years old AA rebranded. I wouldn't be
surprised at all if they were 10 years old AAA repackaged. Someone
did this with capacitors, transistors and other components.

Here are some examples.http://goo.gl/vdEKF

If you buy cheap chinese cells, avoid BTY at any cost: they're not
necessarily fake but their current values are blatant lies.

That's what I bought (BTY) but the price was right. Got 4 for 63
cents. Thought about leaving negative feedback, but since the price
was fair, I didn't leave any feedback.


I just got a message from ebay requesting response to a survey about
the recent (BTY) battery purchase. They wanted to know how I rated the
sellor on a scale of 1-10, and my thoughts about the transaction, and
if I would buy anything from the sellor again. I gave him a 5 and
explained the batteries were worth the low price and I would buy from
him again, but probably not BTY batteries. I didn't want to leave
negative feedback, since the guy probably doesn't know what he is
selling.

If that is the case, you should at least make sure he does know.