Re: meijer powercell precharged 2100 ...some numbers
Those look a little like the Kodak Pre-Charged/GP Recyko type of cell to me.
I've done some more testing on these batteries and based upon how stable they are into a 2 ohm load (i.e. unloaded cell voltage versus loaded down cell voltage), they seem to be the "best batteries" that I have yet owned amongst my 47 AA rechargeables:
HTML:
_Battery____capacity______Ron____________Notes
Powercell 2100-mAh Ron=0.02 ohm 1 month old (4/4)
Energizer 1600-mAh Ron=0.04 ohm 4 years old (4/4)
Panasonic 1600-mAh Ron=0.08 ohm 3 years old (6/6)
RayOvac 1600-mAh Ron<=0.12 ohm 7 years old (7/15)
Duracell 2650-mAh Ron=0.12 ohm 2 years old (4/6)
Energizer 2500-mAh Ron=0.16 ohm 2 years old (2/2)
======\/Problems powering A580 camera\/========
FailSafe ???????? Ron=0.30 ohm 2 years old (4/4)
Digital 2200-mAh Ron=0.32 ohm 1.5 year old (4/4)
SupremePower 1800 Ron=0.40 ohm 1 year old (2/2)
The terminology (5/13) used under "Notes" means that 5 of 13 batteries had this characteristic. The others could be twice as high in value and thus a low fractional value indicates variability.
The Powercells are the only "low self discharge" batteries that I have but so far I'm impressed by the "voltage stability"/"low on-resistance". The
Digital,
SupremePower and
FailSafe batteries all had
R_on>=0.30 ohms and caused the A580 camera to shutdown after about only 20 pictures were taken. Out of the
20 bad batteries (and 27 good ones) that I have, these no-name batteries have been obtained in the last 2 years but have the most operational problems early into their life...it seems you get what you pay for when you go "no-name" in battery circles. The exception being the Powercells by Meijer. Generally,
Don't Buy No-Name brands of batteries.
The Rayovacs have been real workhorses that I've had for over 7 years and have been cycled many times and they seem to still work well (those with Ron < 0.24 ohms) into the my new digital camera that is very particular of batteries. The no-name "Digital 2200 mAh" batteries are good for about 30 pictures in my digital camera whereas others can give a couple of hundred...they're junky. The issue is a false shutdown due to the high on-resistance: They will be relegated for use in in my battery powered wireless mouse.
The tradeoff with using larger high capacity cells (> 2100) is an decrease in voltage while loaded characterized by high on resistance (Ron). I'll be sticking to the lower capacity cells (~2100 mAh and below) and those using the LSD formulation pioneered by Sanyo.
EDIT: Ron details,
here
PeAK
