Modern Replacment for 1980's fuse

[HuweyII]

This battery pack for a 1984 HP 110 Portable has a fuse or maybe a fuseable resistor.  The wiring diagram and circuit description lists it as a 0.5A fuse.  So far I can't make sense of the color codes.  It looks like a fusible (flameless) resistor to me, except that the color codes don't match up.

This fuse was blown due to my own ham-fistedness.  So I need to replace it.  My gut says to just replace it with a 0.5A pico fuse.  But I figured I'd ask here if anyone knows exactly what this is.

Maybe replace it with something like this?  https://www.amazon.com/uxcell-Axial-Leaded-Telecom-Communication/dp/B07S79DGF6/

The fuse is the green resistor-looking thing on the top of the battery pack board in the attached photos

[coromonadalix]

seems to fit     attached image not sure it's the good one

green black and brown   red

who would be 5  .....  exponents / divider / multiplier ....  should be  50 divided by (10 exp 1) 100,    will give your 0.5 amp,  and the red color give a 2% tolerance ??

you have to find the charts on the web 

not to be confused with the resistor color codes, because the multipliers bands  etc ...   

[HuweyII]

Awesome thanks!  I've never come across a table of color codes from fusible resistors.  Now I know!

[wasedadoc]

...  should be  50 divided by (10 exp 1) 100,    will give your 0.5 amp,  ...

5, 0, multiplied by 10^1 is 500 mA.

[Ian.M]

Google: 500mA axial pcb fuse to find ones in the same form factor to replace it. 

I note the battery pack uses Cyclon lead acid cells.  Unless they've been replaced in the last decade or so and kept charged, they are probably dead or near dead.  Fortunately they are still available.   For bench testing you could hook up any small 6V SLA to the terminal board.