I am in a possession of a Samsung Digimax S 700, typically peacefully residing in the glove compartment of my car. I need the camera very occasionally (say, once a month) for everyday-type of photos such as photos of friends, family, nature, the contents of a whiteboard, small text on contracts I'm signing, etc. The camera is powered by two NiMH AA batteries, which are about 10 years old and are of low–self-discharge type; the brand is Soligor; the marking says "TYP. 2100 mAh, MIN. 1900 mAh". As of today, the maximal charge of a single battery is about 1700 mAh – 1800 mAh.
When my batteries are charged one day before usage or less, the camera works without any problems for 10–20 photos, a short video, or more. No problem. Same when I'm using fresh Alkaline cells. If there is a limit on the number of photos taken, I have not hit it yet.
However, if the batteries have been charged about a week before usage or more, the camera can be turned on, but this action apparently drains so much power that the camera usually stops working right after being turned on; the lens remains extended. With the same batteries, the lens cannot be retracted again; the remaining charge is apparently not sufficient to turn the camera on again (one has to recharge the batteries first to reach that goal). With a lot of luck, in seldom cases, after being turned on, the camera continues working, and one can press the big shooting button to try to take a picture, but, after pressing the button, the camera turns off, with the lens still outside. Again, one cannot turn on the camera and retract the lens with the same pack of batteries (one has to re-charge them first).
If the battery pack is stored outside of the camera, the interval between charging and shooting can be prolonged by 1–2 days, not more. I tried to replace the battery pack by two non-Eneloop NiMH batteries with capacity 2100 mAh per battery; the result was the same. I tried to use Alkaline batteries instead: the first usage for taking a few photos was o.k., but the second usage a few weeks later did not succeed: the camera could be turned on, but after being turned on, the camera was dead after extending the lens as described above.
The camera was at a repair shop (which I don't trust but which the original seller trusted) 10 years ago. They discovered no fault but suggested that the camera be used with batteries of capacity exceeding 2600 mAh. I have not found any useful battery pack on the market then, and I still cannot find such now. (High-capacity NiMH batteries all lose charge very quickly, not suitable for my purposes.)
Some old, non-digital cameras had an internal capacitor which took the necessary charge from the battery while the camera had been turned on. The capacitor served as the intermediate power source for the next photo. Inside that old camera, Alkaline cells could be stored for several years, and the camera still worked after being turned on. If such a camera with an intermediate power source were digital, I would be happy with it. However, I am unaware of such cameras today.
My question: given that I would like to shoot photos once a month at previously unknown times (and, ideally, would like to keep batteries inside the camera to maintain the current date, which is necessary for Digimax S 700) rather than recharge the batteries the day before using the camera, is there any trick that would still make this camera useful to me for the aforementioned purpose?
(Or should I get rid of this camera? In this case, which camera of approximately the same size as Samsung Digimax S700 would not have the aforementioned issue? The only alternative for me would be to use the smartphone Apple SE, iOS version 10.3.3 instead of a proper camera.)