Not long ago Rayovac released a 15 minute battery charger, raising the bar for NiMH battery chargers. Up until that time rechargers took from 7-24 hours to fully charge AA and AAA NiMH batteries. The only catch was that you had to buy special Rayovac 15 minute batteries to put in the 15 minute charger.
Now Energizer has released a 15 minute charger that works with any brand of NiMH batteries. Previously they had released a 30 minute charger, but perhaps due to comparison with Rayovac they upped their game.
The Energizer charger just came out, and we are aware of only a couple retailers carrying it. The price of the charger is $35 and includes 4 AA batteries.
The Energizer battery charger is available from: Amazon