Yeah sure go ahead, but you will see the difference in voltage readings, current output etc in the Sanyo. Don't get fooled with the 2500 crap. The Enelopes is the one trusted by professional photographers especially with external flash. They hold charge longer and don't get exhausted soon.
And oh there is a difference in 'Made in Japan' (Sanyo) vs 'Made in China' (Sony). You get what you pay for.
Note: I realised this when I was taking photos at my brother's wedding with my brand new dSLR with external flash. Made in China ones crapped out fast and the Made in Japan Energizer 2300 mAH set I had laster over 200 Flashes in single charge. Can't beat that.
and oh use a slow overnite charger, they charge better than those fast chargers and gives longer life to the batteries.