orion makes great batteries,,,i have also had great luck with sanyo cells,,its realy the charger you have to worry about ,,,

the 3400 4300,,,numbers are mah milliamps,,,how long the battery will put out a sustained high output,,,

if you know you only need 2400 then go with a 3000 or 3400 mah battery this will shorten the time you need to discharge it .

try the east power 4200's if you can get em ,,,they are pert much new but man they are bad ,,they hold a charge forever and have a new chemical mix that offers longer shelf life and broader power band when the cells get low..