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Photos: Sony PCM-D50
March 24, 2008 11:22 AM PDT 
Lock and load
The secret to the Sony PCM-D50's fantastic battery life is the use of four AA batteries, housed in a swappable cartridge that fits in the back. Compared with devices that depend on an internal rechargeable battery, AA batteries offer users a way to quickly replenish power, and they're easy to stock up on.
Photo credit: CNET Networks/Corinne Schulze
