Best Replacement Battery

[Landee]

Hi Folks, this is my first post. I have just finished getting a 2004 Argo Conquest back to life and now use it in the Scottish Highlands to extract Red deer, Roe and Sika.

I am looking to replace the battery and it seems you guys really like the Yellow Top. I have a few accessories like a winch and an LED light bar so it looks like the dual-purpose Yellow Top would be ideal for me.

My question is this. The current battery is 60Ah and the Group 51 Yellow Top that will fit in the Conquest is a 38Ah. Does anyone think this is an issue?

I am told my alternator is 45Ah. I am more mechanically minded rather than electrically so I would appreciate any help.

[allwheeldrive]

Ah is how long the battery will run when not being charged. Anything over 28Ah in a quality battery will likely have enough cranking amps.
"BEST" and high quality are different things. Yellow tops are quality, no argument. If you want the best battery a Enersys Genesis Pure Lead SLA is the best you can buy https://www.osibatteries.com/p-1005-...tery-42ah.aspx
In 2007 I got a a few free 18AH Enersys Genesis SLA batteries left behind a dumpster. Used it to power 12 volt hobby stuff. The next year the battery in my 80's Honda civic died. I just needed to get to work so I put this small battery in its place. The car was sold in 2017 with the same battery still running!
I used two of these batteries to make an electric lawn mower the same year with 2006 manufacturing dates. As of today in 2020 they are still powering that lawn mower and have been left out in the elements every winter and cut my first lawn of the season without even needing to be topped off.

[thorn]

I also have a 2004 Conquest with the 40 amp alternator and I was able to squeeze in a Yellow Top Group 35 battery into the stock battery tray. I trimmed the plastic base/foot of the battery 1/2 way down this will allow you to slide the trimmed part into the tray. The untrimmed portion creates a notch at the base that catches on the bolt down rods to keep it from sliding forward. I then bolted a small piece of metal strapping on the drivers compartment end to retain the battery from sliding back. I also filled the base of the battery tray with a piece of rubber belt to fill the void and support the battery base because the battery now sits on top of the rim of the tray because it is bigger. These batteries have started my machine numerous times in temps well below 0 degrees F. I got almost exactly 5 years out of the first one I put in and just replaced it with another YT 34 a couple of months ago. I have done some very hard/long winches and run a lot of accessories on my machine and it has never let me down. I keep it of a small battery tender when in storage.