Ping's 15 AmpHr is one rectangular brick. It looks a lot like Juice rider's photos. Normally the demensions are 5.9 x 4.1 x 5.9 inches. Ping made mine 5.8 x 8.5 x 3 inches. The three is too thick to fit in the case. Ping can adjust configuration since the battery is made up of individual foil packets.
Yes, I had to cut out the interior dividers and cut thru the outside wall. This photo is not mine but from bluethermal on
http://endless-sphere.com/forums/vie...149702#p149702 . This picture is of a 36 V, 20 AmpHr battery, so it has a lot more battery outside the case, but the idea is the same.
Ping.trailz ebike10.jpg
Since a 10Ahr battery is only 68% of the volume of my 15 AmpHr, it might fit all inside the case. I'm going to look at that for my second pack. 10AmpHr of LiFePO4 would be better than 10 of SLA, if only because the starting voltage is higher ~ 30 V. I, too, like the cases for the low CofG and the convenience of hook up/ removal and charging and impact protection.