Introduction
Hi!
This is certainly a job you can do yourself, and it doesn't break any seal so it's even warranty-safe.
Just make sure you use a screwdriver that fits perfectly! otherwise you'll end up damaging those little screws.
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Undo screw as indicated by the red arrow.
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for this, you need to lift the rubber covers over the data connectors
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now you have access to the battery.
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The type is CR1616, 3V , lithium type, original brand as supplied by canon is Maxell.
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Battery goes in with the +positive side down (as pictured)
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Conclusion
To reassemble your device, follow these instructions in reverse order.
