So you can easily fit 2 of Shori's LFX14L2-BS12 or LFX14A2-BS12 batteries in there and tie them to give 24V. They're 12V batteries, and dimensions for the type 2 case are (WxLxH) 58mm x 113mm x 89mm. They run around $160 each and come with a 2 year warranty. And those models are rated for 14Ah.