agm battery
 

Looking for input on a agm battery that I can use at the track to run my battery charger off.Also if it can hold a charge for a full day if I charge it over night.

Your track doesn't have power. I lf they do just buy a power supply otherwise I feel for you man. Lugging around an agm is gonna be a pia. You'll want to go with a marine deep cycle agm and they can be really expensive (around $189) but will have the capacity you will need http://www.sears.com/automotive-batt...ries/s-1100201

I use a smaller 50Ah AGM battery for charging at the track. Allows me to charge a few of my 2s batts for 1/10th racing. The best ones are the deep cycles like that used in 3 wheel scooters, electric wheelchairs as they are true deep cycles. You can usually find them used for only $20 or so, and still have enough capacity to last the day for me. Of course, it is all going to depend on the amount of charging you want to do. They say to try not to discharge a lead acid deep cycle (includes AGM) below 50%, which usually equates to 2V/cell unloaded.

battery
 

i was looking at a sla type battery like this one

http://www.batteries.com/home-alarm/...08-202806.html

That battery is not nearly large enough to be practical. It's only a 4500mAh, doubt if you could get a decent charge on a single 7.4V 2S 5000mAh lipo given the practical limits of lead acid batteries as mentioned previously.

Depends on the number of charges, but you likely need an auto sized deep cycle. I used to use a lawnmower sized one back in the 1200-1400mAh sized nicad days. But had to go larger as RC battery capacity increased.

batteyr
 

forgot to mention i will be charging 1 cell lipos 5400 mah

That makes it slightly better, but not much. One issue with a lead acid, although they are capable of relatively large currents, the voltage drops considerably when doing so. Can be a problem with the typical RC charger that needs a minimum input voltage to function, might have to charge at a low amperage. And generally prevents getting more than the 50% recommended out of the battery.

This time I am using Deka standard battery doing very well work done..
I don't have any other battery experience like you are saying AMG battery..
battery related every accessory are available and in good quality and in affordable price.

Just grab a proper deep cycle imo. It's all I do and no dramas at all. I just charge in the back of my wagon. :)