TASCAM BP-6AA External Battery Pack for Portable Digital Recorder

• Increases DR-40 recording time from 17.5 hours to over 50 hours
• Tripod screw mounts under DR-40
• Powers through USB cable
• Holds six AA batteries

This product works exactly as advertised. It powers my Tascam DR-40 recorder perfectly and significantly extends the recording time. As a bonus, it can also be used to charge cell phones instead of running the DR-40 via its on-board USB port. My iPhone 4 charges flawlessly.

Buy TASCAM BP-6AA External Battery Pack for Portable Digital Recorder Now

Not only can you use this for Tascam device, you can also use it to charge any 5 volt device. You just need a usb cable on the other end for you to plug it in. This is like the perfect replacement for the lithium battery for your device because it uses AA batteries. Awesome!