Camera is 2 yrs old & was never dropped or misused. I have been always using Rechargeable NiMh Sony batteries 2500 mAh. Have 2 sets & are 2 yrs old.
Problem: Camera freezes suddenly while taking pictures. On/Off button does not work when camera is frozen. Have to open the battery compartment to power off camera. Then use power On/Off button to turn camera ON.
Happens only while taking pictures with Flash ON.
Problem happens less often with fully charged batteries.
Problem did not occur while taking 50+ pics with Flash OFF.
Picture quality is still excellent.
Sometimes after problem occurs, Exposure seeting gets reset to 0 (I usually keep at -1)
Problem happened first time while using Rechargeable Eneloops. Since then have switched back to my old Sony rechargeables.
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Re: A640 freeezes while taking pictures
Your problem may be due to corrosion on the battery contacts inside the camera
which can prevent the full power of the batteries from flowing into the
camera. Try this free fix before you do anything else: remove the batteries and wipe the camera contacts firmly with
a dry cloth (heavy corrosion may require cleaning with a wire brush,
steel wool, or sandpaper). Remove any residue that may have fallen
into the battery compartment during cleaning, then wipe both ends of
the batteries and place them back in the camera. This cleaning clears
the problem about 90% of the time. If it doesn't work for you, your camera may have
a problem that requires professional repair.
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It has nothing to do with your camera. At least not when your camera is not becoming hot. Some batteries can work for thousands of hours, and exceed the 1000 recharge cycles most battery firms are talking of. But the don't give any guaranty a battery will last that long.
Some camera manufactures give one year of warranty on the camera but only 90 days for the battery. So it could be your batteries are old and worn out already. You can use 2 AA size NiMH rechargeable batteries, to check if the do a better job. They are relative cheap, and should last as long as the original battery pack that came with the camera. Please, even when you are not using the camera, you should charge the batteries at least every 2 or 3 months. Then they stay in a better shape. Never use NiCD rechargeable or manganese (Zinc-Carbon) batteries.
Even the very expensive alkaline batteries won't last half the time a NiMH could work. GP batteries, makes ReCyko+ rechargeable batteries, that not exact do have the capacity of the NiMH batteries, but they can hold the charge much longer. You only have to charge them once a year, when you did not use them. and still after a year they should have enough power to make a bunch of pictures.
Depending on which camera model you have, you can use regular (lithium!) AA batteries in these cameras, no need to buy the specialty 2-battery rechargeable pack and use the printer dock to charge. You can go with regular NiMH rechargeable batteries as well.
I'm going to assume this camera is not new as the first review launch date was in 2006 and updated in 2007. If the rechargeable batteries are two years old my first suspicions would be that the batteries have acquired a short term memory. Contrary to what the manufactures claim these batteries do get "lazy" The problem stems from not completely discharging/exhausting the batteries before putting them on a charger. If the batteries are constantly drained lets say to have power then charged again they will eventually give you only 1/4 there power before the battery indicator shows exhausted. What I have my associates do now is put the batteries in lantern type flash lights and just kill 'em then place them on the charger. Yes i did have to triple the amount of batteries in the fleet BUT now instead of getting six months out of a set of batteries we now have gotten two years. Also there are new types of rechargeable batteries on the market that are in the 2000mAh range that will retain 80% of their power if left standing dormant. I didn't think these would work and was always trying to get the most powerful batteries I could but these have proven my theory incorrect and in actual fact will out last the 2800mAh battery. I don't know where in the world you are but my first introduction to this type batter was with a Sony brand, now I have seen them in the department store check out line. It's pretty easy to find then as they state right on the package ready to use and claim the battery power holding capabilities right on the package. I don't think it's your camera I'm sure it's the batteries you are feeding it. Hope this was a help
50 pictures is way more than I get from this camera per battery charge. It draws 500mA when on, and 1000mA of current from the batteries when charging the flash so battery life will be short.
It also has a design flaw that says low battery and shuts off even when the batteries are 95% charged.
Be aware that rechargeable NiMH batteries self discharge at a rate of about 1% per day. They have a strong Amp-hour rating but need to be freshly charged.
IF the camera won't turn on at all when trying NEW 1.6V Lithium AA's (those are the strongest AA's made) or freshly charged 1.2V NiMH batteries and you know they are charging up to at least 1.35V per cell (they charge above their rating) then the camera itself has a problem.
Even if you get it to work, this is one of the lowest quality camera's made. I have quite a few decent camera's and I've never seen anything like this one, it's rated for 5Meg but has less resolution than an old 2Meg Canon. I paid $39 for it new on 3-2010 and I sent it back because it has no purpose since it can not take a clear picture.
Sorry but the only solution with this camera is to get something better (Canon, Sony, Nikon).
i suggest replacing a fresh battery will most likely solve your prob, overtime rechargeable battery can drain easily, try changing with a new battery and see if it does work well, there might be insufficient current, thats why it tends to drop of voltage easily upon using,
there is a specified lifetime for rechargeable battery, depends on your usage and charging method, theymaybe fully charged but sometimes wont give you enough power to drive
A camera rep told me that use about 2500mi (?) batteries instead of the 900 I was using otherwise the batteries will be depleted with just one picture. Digital cameras or any other digital piece of equipment needs the extra power. Make sure that your charger will charge the 2500 power ones fully.