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What is the energy decay speed for different resonator levels?

I know for sure that L1 resonator decays at a rate of 10% a day or 100 XM a day. I have not explicitly tested it for resonators of higher level and now I think it becomes more and more relevant.

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up vote 8 down vote accepted

All portals decay 15% per day.

Source: Official Niantic documentation.

Portal Decay

Resonators are powered by XM. Resonators start with a full charge, but the XM store is consumed at a rate of approximately 15% per day.

(Emphasis mine)

Portals used to drain at 10% per day, but it was increased in an update early 2013 to be 15%

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That is not nice, try to recharge a lvl 4 portal even as lvl 6 player. I hoped it was not percentage based. – BanditoBunny Dec 10 '12 at 15:09
Maybe stupid question, but what does "per day" mean? Does it mean that at midnight all resonators loose 10% or a day at the time of deployment of the resonator? – keiki May 4 '13 at 21:15
@otakun85 I'd open a new question for that, but from anecdotal experience I believe it is the latter - the entire portal drains 15% at the minute that the portal was captured. – Daenyth May 4 '13 at 23:45

Recently decay speeds are different for different resonator levels from 10% for R1 to 15% for R8

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Is there a source for this? – Texenox Sep 12 '15 at 14:17

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