The SD-2 Sound Devices MDV Battery Adapter from Hawk-Woods is designed for the Sound Devices MixPre-3 and MixPre-6 mixers. The adapter allows you to use an MDV (Sony L-series) battery. It slots onto the rear of the battery compartment of the Sound Devices mixer and clicks into place to ensure a secure connection.
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This should be the standard battery sled for the Mixpre ii. I don't know what Sound Device is thinking when they design the AA battery sled. Huge design failure!. Keep falling and never securely locks. I like this sled better (Sound Device has one too). And when using it with Sony NP-F7XX, it last up 8+ hours (4 times longer than AA battery), and I'm sure it will last up to 12 hour (6 times longer) when using Sony NP-F9XX. The only cons is it's super thight. Don't use it if you plan to remove the sled very often. I suggest use USB-C port for file transfer when using this.
Even though it seems to be of a design that may fail, I have used it non-stop for two years of Production Sound for double system film sound recording and it has worked perfectly. I actually bought two of them in case one failed, but so far I have only used one. It is much better than the one made by Sound Devices, because it has a lower profile when fitted with an XL-B3 battery pack. A professional will pay attention to what they are doing when inserting and removing this, and will never have problems!