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While many digital camera manufacturers are migrating their lines towards rechargeable battery packs, Canon has taken a different approach. About half their line uses a Canon digital camera battery – a rechargeable lithium ion variety. But Canon offers quite a few models that don't require these expensive batteries.
All eight of Canon's current “A” model PowerShot cameras (A410 – A700), plus the advanced PowerShot S2 IS and S3 IS models, operate on AA batteries. This gives users the option of using rechargeables, like NiMH or NiCad, or any AA alkaline battery.
Since most lithium ion batteries cost in the range of $35.00 - $50.00, most snapshooters won't want to purchase a spare. For them, a full-featured camera that runs on AA batteries makes sense.