I bought a AccuPower AP2020 AccuManager 20 off of Amazon some 5-6 years back, I was going to use it to charge 9v batteries for my toy remote control car but I didn't play with it enough to justify buying a rechargeable 9v battery.
You have a few charger that can handle 9v rechargeable, they are:
AccuPower IQ338Xl (2 bay)
Powerex MH-C490F (4 bay)
Powerex MH-C1090F (10 bay)
And Soshine have two charger that can charge 4 and 2 batteries at the same time. There's no model number for them but if you search ebay for "9V 6F22 soshine charger" you'll find them. The black coloured one is the 4 bay charger and the white coloured one is the 2 bay. They claim to handle Li-ion, LiFePO4 and NiMH.
I don't own any of the chargers so I can't comment on how good/bad they are. Wait for another member of the forum to chime in before you buy as they might own the charger and can give you their opinion on them.