Hi,
I have found a cheap DC 12V 1800MAH Super Capacity 1800MAH Rechargeable Li-ion Battery.
How cheap?
If it is on ebay, be very very very careful about capacity claims.
If it s this one.
I would be very careful, there are no specification listed in the actual sales page.
Banggood have a better spec sheet.
Benggood review for the product is worth reading, one guy complained it was only 300mA and they offered to replace it.
Tom... 