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Body Battery, how it works?

Hi all! Just wondering how the BB is actually working...I've bought my 945 almost 3 weeks ago and for around 2 weeks every night my body was "fully charged" at 100%; then, without any significant change in my training or behaviour during the day, the over night charge was decreasing day by day...the  other night, I went to bed with 20%  left and I woke up after almost 8 hours of sleep with 39%...so only a 19% of charge during almost 8 hours. Who knows exactly what can influence the "recharge" time?