Ok, first off what battery pack configuration does your ride accept, hump or stick pack? If it's hump then here are a few options:
- 7.4v Common Sense Lipo 1500 mah pack - this pack will last me through practice and all of my quals. I will then drop in a fresh pack for the mains. Or if your on a budget, top it off before your main. You can charge it at 1c, or 1.5 amps. Great little pack and very reasonably priced, also, it has a balancing lead, which I like as I always balance my packs:
http://www.amainhobbies.com/product_...ducts_id/13161
- Orion also makes a nice looking pack, but it does not have a balancing plug and I don't know if that's a good thing or not, but check it out for yourself:
https://www.bbthobbies.com/product.php?productid=16561
- Protek makes some very high quality packs. I ran there stick packs in my Xray's.
http://www.amainhobbies.com/product_...ducts_id/13508
Carolinas has a few options for the Losi packs which come in either 1650 or 2000 mah ratings. You would need to check the fit on the larger pack as it could be pretty tight!
http://carolinasrc.com/Webstore/Scripts/prodList.asp
If you have a stick pack configuration your choices are a bit more limited:
- Protek makes a great pack. Here is a link for their stick pack configuration:
http://www.amainhobbies.com/product_...ducts_id/15789
I am sure you will get varying viewpoints from others but these are the ones I am familiar with. Lipo is a smart choice if you are ready to make the move, i.e. have the right equipment to charge/balance them and don't abuse them, i.e. over charge/over discharge or leave them in direct sunlight for prolonged periods of time. You will get hundreds of cycles out of these packs and crazy long run times.
Good luck!