![]() Īlso, there is a small switch on the CF card slot. Push it several times with a small screwdriver or clean it. Open the battery compartment and you should be able to see the small white switch. If it gets stuck the camera can think the battery is not installed and not power up. There is also a switch on the main battery compartment door. You can get this battery at most drugstores for about $5. See the attachment (page 171 of the manual). You can check the battery with a voltmeter I personally would replace it since it is at least four years old. Open the main battery compartment and you will see the battery holder for the CR2016 next to the battery door hinge, it should have "CR2016 3V" written on it. If the date/time is reset when the battery is replaced, replace the back-up battery with a new CR2016. If that battery is low you can have issues powering up the camera. Canon and EOS are trademarks of Canon Inc. There is a CR2016 battery that maintains the date & time. Repeat this 2-3 times and see what happens. Might be worth a try, run one of those batteries down to a dead state, then allow them to fully charge. This supposedly extends battery life a considerable amount. I was also advised not to charge to the green status light, in other words stop the charging process at steady orange which is the 90% level. I was guilty of this in that I don't frequently use the camera, but if I take it out to take some pictures I often charge it, even though it might have been charged 2-3 weeks back. I was also told that the cause of this is frequent charging of the battery when it doesn't really need it. The same thing occured perhaps a year later, and again the procedure worked. This procedure restored my battery back to the ability to take several hundred pictures. Repeat this about three times and then you should be OK. Then recharge to a steady orange status light. The procedure I was given was to set the camera so the screen stays on, and then let the battery totally run down. Even though lithium ion batteries don't have the "memory" of the old NiCads I was told by Canon support that the cameras built in charging circuit might need recalibration. After a years or so of ownership, with my G2, sometimes even a few pictures would result in the low battery indicator. The 40D uses the BP-511A but I wonder if issues I had many years ago with my Powershot G2, which used the BP-511, are related.
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