Natural Science Forum / Chemistry / Electrochemistry / November 2003

2100Mah Cells, in a six-pack, being charged at C.
Mfgr says to terminate high rate, at 40C.
The pack runs up from 28C to 40C in 26 mins, with voltage slope still
rising, indicating to me that it's nowhere near full charge....

Ok, NIMH charger question:
What should happen, when the constant current source runs out of compliance?
IOW: As the battery charges, it's voltage rises.  If the input voltage to
the constant current source isn't high enough, the constant current source

I was about to order a Maha 777plus charger (I need the ability to
charge different Ah and voltage NiMH packs) when I saw a distributor's
add claiming "Maha 888 charger comming soon".  Anybody know anything
about this unit?  TIA.

Hi,  
I found a new battery at:
www.batteryx.com/product/Document/012-PV001/012-PV001.asp?ProductID=1069
This is a new rechargeable Li-ion battery for use with digital cameras. they

How to maasure the conductivity (or resistance) of an organic thin film?
Is it possible to use just potentiostat/galvanostat to measure the conductivity?
(not by AC impedance method)
Please give me some suggestions, thanks!

Can I permanently seal (make waterproof) a pack of NiMH batteries. The
reason I am thinking I can't is because of off gassing of the cells.
Should I be concerned about this or not. If it is a concern does anyone
have any ideas about making a pack waterproof?

I have a 12V 60Ah, vented cell NiCd battery.  I tested this at
-40degrees with a 500A load and got 5min to a 9V end point.  A
theoretically perfect 60Ah battery would have given 600A for 6min so
this is truly impressive performance.

Initial tests with the Ametek servo motor, 1950s technology, are done. Various
gears can be fitted for a second stage collecting data to get motor/generator
slopes.
The new motor is here. 1990s technology, a Servo Disc with integrated tach.

After charging the six PC 2500 2700 F caps on my bike to around 12 VDC, I
measured about 0.01 V / sec voltage decrease while operating two spiral
fluorescent bulbs of 9W rating each through a Radio Shack 140W rated inverter,
running off the caps.

http://home.flash.net/~brownt/misc/battery_1922.zip
Tim

A friend bought this battery for his boat. I would assume
that, as with most AGM batteries, that a charger set to
13.5~13.8vDC would be appropriate. A Google search on the
battery seems to be limited to the Interstate Battery site

I'm debating on whether or not to use NiCD cells (provided with the
radio that is using the cells) or substituting these cells with
Lithium-Iron Disulfide cells (AA provided by Energizer) for a high
altitude application where the enclosure temperature could easily drop

Sorry for asking newbie question
Does galvanostatic discharge mean discharging the batteries either in
constant current or with linear loads ?
thank you

I have a 12 volt a Deep Cycle Boat trolling motor battery I'd like to
keep charged via my chevy s10 v6 blazer. I currently have two 4 guage
wires running about 6 feet to the back of the car connecting the
primary battery to an 800watt inverter. With the engine running I can

   I have a nice UPS I got a great deal on because the unit won't hold
up at all due to a worn battery.  The original batteries are dated March
1996, so I'm sure it's about due for a new set of batteries.