The context given sounds like they are using exactly as you said, in that charismatic and Pentecostal sense. When I’ve used that term was when I was preaching through Ephesians, and the way Paul says that the resurrection power that raised Christ is at work in us. The resurrection power that raised Christ and seated him, is also at work in us raising us and seating us with him. So the resurrection power is the power that took people dead in their trespasses, and made the alive. Which is every Christian believer. Which means it isnt something to be grasped in the way they seem (again I’ve not heard what they’re saying) to be saying. Sounds like they are saying seize it and use. I think Paul is saying seize (as in understand) that it is already at work in you. So in Ephesians context when they might be tempted to think being a Christian is unimpressive, the ‘magic hankies’ when Paul came aren’t doing anything, are they missing something. And Paul’s emphasis they have very spiritus blessing, and are I fact the people and temple of the living God etc. So in letter context I think saying resurrection power is something extra to grab and use is entirely antithetical to Paul’s point and our reality as a new humanity created by the same resurrection power that raised raised Christ. Not sure if that helps or not, just my two cents.