I'm surprised you can't get enough juice from connecting a battery or jump pack under the hood to pop the trunk from the fob or trunk switch - that's what those jump posts are meant for. Is it possible you have a valet lock in the glove box that is preventing the trunk from opening?
By the way - you should always disconnect the negative terminal from the battery first - the positive cable will be live & could short something.
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining
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