Need Source to Replace Jumper Fuse

My brother gave me his Fixit Tools 300 amp portable battery charger (TE4-204) but it is missing a 1 amp fuse (port located near the upper left of front label - see pic). We can't find a source for replacing the fuse. Is that fuse important for doing a battery jump? Any assistance with locating a replacement fuse will be greatly appreciated. Thanks.

http://i.imgur.com/k9amOns.jpg

I think that fuse is to protect those 3 different voltage output ports to the right of it.

I think that fuse is to protect those 3 different voltage output ports to the right of it.
Good to know Copytech99. It looks like something that needs to be replaced though. Thanks for your prompt reply.

It would only be needed if you wanted to use any of those 3 output jacks the line leads to.

Measure the fuse in mm.

Popular size is 3AG (larger glass) & GMA (smaller glass)

It would only be needed if you wanted to use any of those 3 output jacks the line leads to.

Measure the fuse in mm.

Popular size is 3AG (larger glass) & GMA (smaller glass)
Thanks for your reply Copytech99. I just found the "Bussmann GMA-1A 1 Amp Glass Fast Acting Cartridge Fuse, 250V UL Listed, 5-Pack" on Amazon and it looks like what you recommended. Thanks again.

Yep, should be a common size.