The MX-8AA from Sound Devices is a spare battery sled intended for use with the MixPre-3 and MixPre-6 audio interfaces. It also works with MixPre-10T recorders. The sled houses eight AA batteries. It is recommended that you use rechargeable NiMH batteries with this unit.
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My title pretty much sums it up. I've owned a lot of Tascam and Zoom recorder/mixers over the years and been perfectly happy with all of them. I recently decided to invest in a legendary Sound Devices MixPre-6. It lives up to it's reputation. It's only flaw is it's power supply options - they are numerous and all come with compromises. This is the option I went with. It works, and that's about all I can say about it. It's the option that fits best in a K-Tek MixPro bag. The design is funky, the material choices and build quality are questionable and at $80 it is grossly overpriced. Buy a full double set of eneloops and you'll probably be set for a full day of recording.
This is good if all you need is 2.5 maybe 3 hours of recording time (at one time), which fits what I do, plus it doesn't take up much room. You can always stop and replace the batteries, if you need more time, and i use the 3200 Energizer rechargeables. It snaps in the back of the mixPre 3, and has a very snug fit. It is hard plastic, but it does what it is designed to do, and so I'm pleased with it.