need cap. charge indicator

I built a battery tab spot welder using multiple 5 volt 150,000 uf computer
grade capacitors in parallel, as the heart. The capacitors are charged
using a small 5 volt unregulated charger. This works well, except I am not
sure when the capacitor bank is fully charged up, as it takes a long time.

What can I use as a charge indicator? All I really need is for an LED to
light or something like that. Can someone please suggest a circuit or an
idea that would work for this application?

Thanks
Jim


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