In Japan Sanyo just announced two new versions of the Eneloop, the Pro and the Plus (in the US, it appears that the Pro may be named XX). Both are likely to work their way into Nikon Speedlights soon. The Pro version adds juice: it's now a 2400mAh battery, up 20% from the usual Eneloop (2000mAh). More power storage means longer lasting batteries in a flash unit. But...Speedlights like the SB-900 are quick to overheat. The Eneloop Plus adds a thermistor to keep the battery from overheating. While that won't reduce flash head temperatures from rising, some of us have noticed in our SB-900's that if the batteries start overheating due to constant use, the SB-900 shuts down sooner than it does if the batteries stay a more normal temperature. No word on when the new models will make it across the Western Pond, but the Pro isn't available until July in Japan and the Plus comes in December. For those not in the know, one of the reasons why the standard Eneloop is often preferred by flash users is that it is a very consistent, heavy duty battery: it handles up to 1500 full charging cycles, it retains a good 75% of capacity after three years of storage, and it seems to recharge up the same predictable level for most of its life.