I have a few (at least 4) extra 12v 17ah batteries that I salvaged from a UPS.
They work great, but come with no guarantee! I have been using this same type of batt for a while with no problems. It lasts me all day (over 12 hrs) without showig any sign of it being tired.
The cost is FREE!
Hit me up @ the launch to claim one or two, or shoot me a reply and I will save one for you.
I did a search on the unit and this is what it is (top pic).
http://www.batterywholesale.com/batt...tml?prodID=398
I might have a few of the same AH and V but a different make and model.
Also, For the last 3 years I have been using a dc power supply to charge my batteries. It is 12v and 100ma.
http://www.bb-elec.com/product.asp?sku=485PS2
These things work great! Just hook it up the night before you plan to use it, and in several hours it is charged. I can get these too if anyone needs one.
Mark