The Sound Devices XL-B3 Lithium Ion Battery provides an output voltage of 7.2 V DC. It features a charge capacity of 6600mAH, and is designed for use with the PIX-BMT and Sony L-compatible mounts.
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Glad to get a these.� Note for users of SD 744T:� fits tightly, though they work well
I purchased this for my Sound Devices 702 recorder. The battery the recorder comes with is 2,000 mAh, so this, at 6,600 mAh, is quite a bit higher capacity. While I have not yet used it extensively, I can definitively say right now that this battery is fantastic. It seems to last way longer than it should. Even after hours of recording it's still not dead. Of course, it's worth noting that this higher capacity will greatly increase charging time as well as running time. Also, the battery is physically much larger than the one that comes with the 702, so make sure that whatever case you are carrying the 702 in has room for it to protrude from the back of the recorder, as it is not flush with the unit like the stock battery. In short, it's a high capacity battery that does exactly what it's supposed to do.