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You may need to use a more powerful power boost, I don't think they make a larger model with battery charger included though , so you'd have to wire up a separate one.

I'm actually surprised that you're having an issue though, everything I've seen about the pi2 is that its power usage is just slightly higher than the B+, and I've run mine from the battery with a WIFI module in the USB with no issues.

Power Comparison

Powerboost 1000

L-ion / Lipo Charger