Solar Pond Pump Battery Backup

[MrWizerd]

I am putting this here because I am sure this is a total noob question but...

 I bought a cheap solar powered pond pump and I want to set it up to be able to run while the sun is shining, and charge a battery when the sun is shining, but when the sun is gone for the battery to power the pump.  I have two small solar panels, both are able to operate the little pond pump.  One is rated at 170mA with a measured 8.5v on a  cloudy day, the other I have measured at 40mA at 7v on a cloudy day.  The bigger one runs the pump well, the pump operates at 5-12v and 100-250mA/h.  My thought was to use a 9v rechargeable battery and either charge it with the smaller panel or setup the two panels in series and charge while running the pump, and then run the pump when the sun goes down from that same 9v.  I don't know if I can get a significant charge in either situation and I may need to switch to bigger panels to do this. I have thought of a couple ways to go about doing this, but I am not sure which would be the best way to accomplish something like this.  Anyone have thoughts?