This is the upgrade for your ktm or husqvarna.
Ktm 450 battery upgrade.
Each kit includes the oem battery box from the xc f models that use a bigger battery from the factory as well as a new tusk lithium battery.
Like the original poster i had a 2004 450exc and wanted to upgrade to a 05 battery hence i purchased from ktm dealer the bigger box.
The battery has a 2 year warranty and i would recommend getting a lithium battery charger.
This presents a problem when trying to upgrade to a quality battery as the stock battery tray only allows for the stock battery size without cutting.
Each kit includes the oem battery box from the xc f models that use a bigger battery from the factory as well as a new tusk lithium battery.
As far as i know the 2004 battery box was smaller because the battery was smaller than 2005 onwards.
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The tusk ktm battery upgrade kit is a must have for the 2015 5 2017 ktm sx f models.
I know a couple guys that have used regular chargers on other brand lithium batteries and this resulted in a burned down charge and another in a trailer fire.
To mount the kit it is as easy as removing your current battery and battery box and replacing it with the new battery and battery box.
The bigger battery box allows more.