May I ask if-
a) the battery indicator behaved differently previously?
b) your shot count is now noticeably lower than before?
There may be two main reasons why -
1) the batteries are now losing their charge -
from the age - this does not seem likely -
however batteries can get damaged from over-charge, over-heating, and over-discharge -
and if persistent can build up over time.
Unfortunately "eneloop chargers" range from really good to pretty marginal - depending on the model.
The oft recommended optimum charge current from knowledgeable battery people is 1/2 C
= ~1000mA = 1 Amp for eneloops -
lower charge currents may seem "kinder", but they are not, as any current below about 1/3 C (for eneloops < ~ 650mA) and it is very hard to detect end of charge - which leads to over-charge accompanied by over-heat a double-whammy for the health of one's batteries.
Using chargers (any brand) that have to charge in pairs can lead to unbalanced charge -
either one of the pair is under-charged,
or worse - one is over-charged (therefore damaged over time).
It only needs one battery to be sub-par to bring the whole set of 4 down.
2) different shooting - if the battery usage is high, the voltage may drop momentarily
(eg: lots of flash, live-view or video)
- causing the meter to show a lower battery level -
allowing batteries to "rest", eg: turning camera off for a while
- normally allows the batteries to recover and again show a higher level. This is quite normal.
eneloops, for anyone who reads this forum regularly, are the overwhelming recommendation for Pentax dSLRs that use AA batteries.
The main reasons are because :
1) they hold their charge, so returning to the camera weeks or even months later the batteries still work.
2) this is not generally known - but eneloops maintain their operating voltage under-load much better than any other NiMH including most other
LSD (Low Self-Discharge) batteries.
Pentax dSLRs using AA's are notorious for being battery fussy.
I am sure photolady is well aware of this, and that is why she is using them.
I have 4 sets of eneloops that I have now owned for over 3.5 years -
started using them in the K100D where I got on average over 1,000 shots per charge
then 2.5 years ago in the K-x - over 1,200 shots per charge
One set was kept in the K100D when semi-retired and kept mostly idle for 2+ years -
the projected shot count from the remaining charge would have been 955 shots.
please see:
eneloop (Duracell Pre-Charged) long term report (2+ years)
My experience with batteries in the K-x has shown:
full
Green lasts for about 1/3 (33%) usage -
half
Orange first shows when there is still about 2/3 (66%) capacity left -
empty
Red shows when there is about 1/6 (16.7%) capacity left.
(I am on firmware version 1.01.00.07; and shot count 48,981 - so that is from 41 changes of batteries)