My coolpix 7900 had not been used for 3 weeks or so and the battery went dead. I recharged the battery and so it could turn on and I could see the pictures in the memory, but in all other modes, there is no image. I can no longer take additional pictures even though I have lots of memory left.
The blinking red clock means the date and time are not set, I think. I have a 7900 that won't take pictures after a battery charge. It's worked for over 3 years and then suddenly no more pictures. I uploaded firmware version 1.2 and that didn't fix it either.
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If the rechargeable battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.
We own a Nikon Coolpix camera as well, which uses regular AA or rechargeable AA batteries.
Assuming you have tried new batteries, (if you haven't, try new alkaline batteries), it's probably time to get a warranty replacement.
You might want to also look at the battery connections inside the camera to make sure they are clean and making good contact with the batteries.
the camera takes just about any AA pair of batteries ... lithium will give you the most pictures .. your NiMH batteries should last longer unless they are old .. you may have one weak battery ... you can try a pair of standard alkalines to see if there is something wrong with the camera .. if those work ok then you need a new set of NiMH ... there is a new type out called "eneloop" .. they are just like normal NiMH except they dont go dead when you store them .. even after a year they are still charged .. with normal NiMH batteries as they age they will self discharge in 2 weeks or so .. so you have to charge them just before you use them ..otherwise they go dead on their own .. if you charge them then not use them for a week then you will not get nearly as many pictures ... the eneloop batteries fix that .. you can also recharge them many more times than standard NiMH batteries .. they cost about the same ..