Natural Science Forum / Chemistry / Electrochemistry / March 2006

Hi, sorry if this is not the right news group, or if this has already
been posted, but I'd like to know if anyone of you can tell the
difference between these batteries groups:
SR44, SR44E, SR44W, SR44SW

Hi, sorry if this is not the right news group, or if this has already
been posted.
Anyone can tell the difference between SR44 and SR44E cell batteries?
Yesterday I bought 3 for my HP 11C, and after one night, now, the

I have two older Humminbird fish finders that are set up as portables
using a home-brewed case. They are used intensely during a weeklong
family fishing trip in August, but sit idle much of the rest of the
time. They can run on anything from 10-16 volts.

I intend to string seven 1.2v NiMh cells in series to obtain 8.4v, then
parallel two of these battery packs. Is there in inherent problem in the idea
of paralleling NiMH or NiCd cells to increase mAh capacity?
I would think that if you were careful about charging each cell ...

I bought a used Lithium computer battery.
All four of the series-connected 18650 cells are open circuit.
There's no sign of overheating or venting.
I'd like to try to patch it up.

I use my laptop primarily with AC adapter in my office. To maintain
maximal battery life. Is it better to leave the battery in the laptop
for constant charging or is it better to take it out of the laptop when
not using it for a long time?

Does anybody know the electrode potential for:
BH3 + 3e- = B + 3H-
?  If so, what is it?

I have an old Energizer brand AA NiMH (made by someone else I'm sure),
AccuRechargeable 1,200mAh Made in Mexico.  
When charged fully charged and discharged at 250mAh to 0.9v after a day,
the battery has almost the full capacity, but if I let it sit a week, it

Does anybody know of an on-line tutorial or a discussion group about
battery chemistry and performance?  Scientific, not "which battery
should I use in my iPod", rather, what semi-permeable membranes are made
of, does Titanium work as an anode, why don't we see Lithium - Air

can you tell me some forum about lithium ion batteries
thank you!
email:linlin0331@gmail.com
if you can ,please give me a email

Hi guys, I hope you don't mind a naive question in what seems a
technical group, but I'd like to know how companies are making
'compatible' batteries and chargers for like 10% of rrp.
In particular, I'm looking at Canon's CR-560 charger for BP-511 1400mAh

I have opened an ordinary battery to get the carbon rod and the black
powdery stuff around it stained my drawer. I had some nicads in there
and I was wondering if the nicads would be affected?
Some of the nicad batteries did have some white stuff on the positive

When they say charge efficiency is xx %, what are they referring to?
I do not know if they're referring to Ah discharge/Ah charge or Wh
discharge/Wh charge.  
I would imagine a battery with 100% charge efficinecy would have a

I am trying to get access to a paper title:
Authors: D.-K. Kim; T.-H. Ha; Y.-C. Ha; J.-H. Bae; H.-G. Lee; D. Gopi; J.D.
Scantlebury
Source: Corrosion Engineering, Science and Technology, Volume 39, Number 2,

we have a baby monitor that uses 1000 mAh NiCd batteries. The batteries
are charged by the device itself. The batteries are in a poor
condition, and don't work as they should anymore.
Is is safe to replace the batteries with e.g. 2500 mAh NiMH batteries?