I just callibrated my double Polarcell pack today, the 2x BL-5J pack is don to 980mA/h that is 490mA/h each on packs marked to be 1500mA/h each, that is after about six months of use.
I accept that there is no return to the amazing Scud, that technology is apparently lost to geek-kind but someone point me to a BL-5J battery which at least will keep a realistic 1000mA/h for a t least a year so I can build a double pack.