I had tested the default google browser with batchgeo several versions of Android ago. I don't remember any issues. Recently I noticed on my Samsung Galaxy S5 running Android 5.0 that you could not re-position the map by dragging or do a pinch zoom.
On the exact same phone the chrome browser worked as expected.
Can you confirm that this is an issue the the default google browser and are you working on a solution to the problem.
Is your map embedded into another webpage? If so, some of those features are disabled and function exactly the same as a non-embedded map.
Send us your URL if not embedded and we can take a look.