I also use the LRP 3000mah 11.1v pack and it's awesome. I race twice a week and get about 6 weeks out of it with no recharge. Just be aware that your tranny has now low voltage cut-off so you need to stay on top of it. It is very expensive though.
BTW - you don't 'mod' the battery tray, you just take some stuff out that can be put back in. There is no cutting or drilling.
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