The general consensus in other threads where this was already discussed is that it is a good battery. You might try searching for these threads to see some discussion
Wierd. I bump charged yesterday morning; battery stats show up time 1d 3h 56s and I'm at 65%.
I only expect 10 hours or so because I use my phone.
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Did you charge your mugen for 12hr as they recommended when you received it? I heard when they are new they need to go through 2 to 3 cycles before you see any improvement.