I have both eneloops and Kodak Pre-Charged LSD in AA size for use in my Pentax K100D dSLR.
This dSLR is well known to be very battery fussy -
Ref: Post #49 (link) in thread - K100D - "Low-Battery" Problem gives details of the meter voltage levels.
The poster measured these voltage levels for the Pentax K100D dSLR -
Battery meter shows full charge at > 1.25v per cell, i.e. >5.00v
Battery meter shows half charge at 1.25v per cell, i.e. 5.00v
Battery meter shows empty and camera shuts down at 1.19v per cell, i.e. 4.76v
On Mar/31 I checked my back-up set of 4x Kodak Pre-Charged AA's - showed full charge when first inserted, but after taking a single test shot - they showed half charge on the camera's meter.
These Kodak Pre-Charged were charged 4 months ago (New Years Eve) - I also charged a set of 4x eneloops at the same time.
In comparison the eneloops were actually in the camera and continued to show full charge level despite having been used more - albeit only occassional ad-hoc shots - but substantially more than the few test shots for checking the Kodak P-C.
Here were my measurements -
Kodak P-C that showed half charge -
#5 - 1.315V, FA=9.0A, 1.301V
#6 - 1.314V, FA=9.0A, 1.309V
#7 - 1.315V, FA=8.5A, 1.300V
#8 - 1.314V, FA=8.8A, 1.304V
these actually look pretty healthy -
and seems they still have a LOT of charge in them.
Contrast with the 4x eneloops which had been used a bit more and were kept in the camera - reading taken Apr/3 after a short photo session -
eneloop - used more, but still shows full charge -
#1 - 1.294V, FA=9.85A, 1.285V
#2 - 1.294V, FA=10.29A, 1.285V
#3 - 1.294V, FA=10.29A, 1.283V
#4 - 1.293V, FA=10.10A, 1.283V
FA= "Flash Amps" - the second Voltages are taken after the FA.
Notice all the open-circuit voltages for the eneloops are lower than the Kodak Pre-Charged - which indicates that these probably are in a lower state of charge than the Kodak P-C.
BUT despite that, the eneloops continue to show full charge on the Pentax dSLR, whereas those Kodak P-C show half charge.
This tells me that the eneloops seem to maintain a higher voltage level Under-Load than the Kodak Pre-Charged.
So it is possible for the Kodak P-C to show empty or even have the camera shut-off when they may still have substantial charge remaining.
This is NOT saying the Kodak Pre-Charge has low capacity, or self-discharges quicker -
in fact the few tests I have seen the Kodak P-C appear to have one of the highest capacities of all LSDs -
But this is a very good illustration of possible higher voltage maintenance of the eneloops over the Kodak Pre-Charged.
Uniross Hybrios are also said to maintain higher voltage levels - the poster in the dSLR thread uses and suggests that -
Chevrofreak claims this too in Post #15 of thread - My Eneloops charge to and hold a higher voltage than other LSD's ... -
he also did some runtimes in a flashlight comparing the Kodak P-C and Hybrio - in posts #13 and #14 in the thread - new Kodac "Pre Charged" NiMH batteries? - which shows that the Kodak P-C have noticably better capacity/runtime in a flashlight over the Uniross Hybrios.
So it appears that the Kodak Pre-Charged do have good capacity -
but the eneloops maintain higher voltage levels -
and this is important for my use in the Pentax K100D dSLR -
since it is battery voltage sensitive.
I think I'll use my Kodak Pre-Charged for flashlights,
and use eneloops for the dSLR.
EDIT to ADD -
Further testing/thoughts -
Kodak Pre-Charged matched eneloops literally step-by-step in unregulated and regulated flashlights see posts #11 and #27 (links)
... and to my chagrin, and pleasent surprise, seem to do as well even in my battery fussy Pentax K100D dSLR see Post #39
(not yet fully proven - but their performance so far have been very good)
Summary of results in Post #57https://www.candlepowerforums.com/posts/2497499&postcount=50
This dSLR is well known to be very battery fussy -
Ref: Post #49 (link) in thread - K100D - "Low-Battery" Problem gives details of the meter voltage levels.
The poster measured these voltage levels for the Pentax K100D dSLR -
Battery meter shows full charge at > 1.25v per cell, i.e. >5.00v
Battery meter shows half charge at 1.25v per cell, i.e. 5.00v
Battery meter shows empty and camera shuts down at 1.19v per cell, i.e. 4.76v
On Mar/31 I checked my back-up set of 4x Kodak Pre-Charged AA's - showed full charge when first inserted, but after taking a single test shot - they showed half charge on the camera's meter.
These Kodak Pre-Charged were charged 4 months ago (New Years Eve) - I also charged a set of 4x eneloops at the same time.
In comparison the eneloops were actually in the camera and continued to show full charge level despite having been used more - albeit only occassional ad-hoc shots - but substantially more than the few test shots for checking the Kodak P-C.
Here were my measurements -
Kodak P-C that showed half charge -
#5 - 1.315V, FA=9.0A, 1.301V
#6 - 1.314V, FA=9.0A, 1.309V
#7 - 1.315V, FA=8.5A, 1.300V
#8 - 1.314V, FA=8.8A, 1.304V
these actually look pretty healthy -
and seems they still have a LOT of charge in them.
Contrast with the 4x eneloops which had been used a bit more and were kept in the camera - reading taken Apr/3 after a short photo session -
eneloop - used more, but still shows full charge -
#1 - 1.294V, FA=9.85A, 1.285V
#2 - 1.294V, FA=10.29A, 1.285V
#3 - 1.294V, FA=10.29A, 1.283V
#4 - 1.293V, FA=10.10A, 1.283V
FA= "Flash Amps" - the second Voltages are taken after the FA.
Notice all the open-circuit voltages for the eneloops are lower than the Kodak Pre-Charged - which indicates that these probably are in a lower state of charge than the Kodak P-C.
BUT despite that, the eneloops continue to show full charge on the Pentax dSLR, whereas those Kodak P-C show half charge.
This tells me that the eneloops seem to maintain a higher voltage level Under-Load than the Kodak Pre-Charged.
So it is possible for the Kodak P-C to show empty or even have the camera shut-off when they may still have substantial charge remaining.
This is NOT saying the Kodak Pre-Charge has low capacity, or self-discharges quicker -
in fact the few tests I have seen the Kodak P-C appear to have one of the highest capacities of all LSDs -
But this is a very good illustration of possible higher voltage maintenance of the eneloops over the Kodak Pre-Charged.
Uniross Hybrios are also said to maintain higher voltage levels - the poster in the dSLR thread uses and suggests that -
Chevrofreak claims this too in Post #15 of thread - My Eneloops charge to and hold a higher voltage than other LSD's ... -
he also did some runtimes in a flashlight comparing the Kodak P-C and Hybrio - in posts #13 and #14 in the thread - new Kodac "Pre Charged" NiMH batteries? - which shows that the Kodak P-C have noticably better capacity/runtime in a flashlight over the Uniross Hybrios.
So it appears that the Kodak Pre-Charged do have good capacity -
but the eneloops maintain higher voltage levels -
and this is important for my use in the Pentax K100D dSLR -
since it is battery voltage sensitive.
I think I'll use my Kodak Pre-Charged for flashlights,
and use eneloops for the dSLR.
EDIT to ADD -
Further testing/thoughts -
Kodak Pre-Charged matched eneloops literally step-by-step in unregulated and regulated flashlights see posts #11 and #27 (links)
... and to my chagrin, and pleasent surprise, seem to do as well even in my battery fussy Pentax K100D dSLR see Post #39
(not yet fully proven - but their performance so far have been very good)
Summary of results in Post #57https://www.candlepowerforums.com/posts/2497499&postcount=50
Last edited: