My revo can't get far

Yes but it's prob not the battery. You may have a short in your receiver somewhere or the antenna wire may have gotten pulled loose inside the receiver. Also check the batteries in your TX they could be low. Last time that happened to me the batteries in the TX were low and it has me puzzled till I figured it out when I saw the light flashing on the TX lol.

my tx bat are new i will look at the ant wire i was thinking maybe because the truck is 7 years old and had set for six and a half when i got it. thanks for leads

It may be the rx battery then.

Those batteries are inexpensive to replace, like 15 bucks or so. That's a great place to start. If it does end up being your radio system then you may want to consider going to a 2.4 ghz. A new system can be had on ebay for 40 bucks.