Canon Ixus 65

First, make sure you are using the right type of battery. LiMh re-chargeables are the best to use.  Brand is your preference. In time you'll find a brand you like the best. Get 1800mAh or larger if you can.

Second, look through the menu on the camera and check to see what battery "type it is set for.  "Alkaline" for self bought, Ni cad for rechargeable. This tells the camera how to regulate the power from the batteries.  Also using the wrong off the self batteries will give you the same result you mentioned.  Make sure it is for "photo" or "cameras".

Third, look into the battery compartment.  Look to see if there is any contamination on the brass/copper contacts. A "green" color is a bad sign.  Can be cleaned with baking soda and a tooth brush but very difficult.  Steel wool wrapped around a cotton swab works but leaves behind small particles (desperate method).  Also, sometimes they put a plastic liner inside the battery compartment to protect the contacts during shipment.  Is it still there?

Fourth, maybe the battery charger is faulty.  It may show the batteries charged but they are not.  Try using another charger.

If all these items I have mentioned are OK and check out, then there is really no other simple fix you can do as a consumer and you need to take the camera back. It is an internal problem.  You have had it lees than a year so it should be covered by warrentee.  I'd push the issue if they say "no"

Good luck and please let me know if this solved you problem, thank you..