What ever happened to the Scud blue dream batteries?
Those were great, soldered easily, and when doubled up and used with a Mugen cover kept over 3000mA/h for over two years before dropping to about 1800mA/h in a few weeks before trying to replace.
The Akku looks good but is more expensive than the old Scuds.
Is there a single high capacity battery around 3000mAh to which we could solder the circuit board and glue the top of a BL-5J?

I also found found another supplier for the Polarcell
http://www.cellephone.de/en/cell-pho...-bl-5j/a-1165/