How can I test Components L3 and L4 for continuity without battery?

Maybe a stupid question but here goes. I need to test components L3 and L4 for continuity since my logic board is having problems charging the battery through the charging port. The only problem is, those two components happen to be located under the charging dock ribbon cable connector.

Since my charging capability is shot, I can't rely on the battery to power the phone. It can be reading 20 percent and suddenly shut off without notice because it's not getting a true charge. So I have to plug it into the charging cable and rely on that as my power source. Problem is, if I disconnect the cable to get access to the components, there's no power going through the phone so I can't test them.

Anybody know a workaround, maybe a way to charge my battery externally (outside of the phone)?

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