New B3?
If you mean the RC10 B3 that was before the B4 then yes most lipo's fit fine. The thing to be carefull of is the height of the pack so anything taller than 23/24 mm will require material removing from the battery brace so it can still hook under the rear shock tower.
I ran my B3 with lipo's without trouble but did have to shave a little from the rear upper part of the battery brace.
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