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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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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
    Commented Dec 10, 2012 at 15:09
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    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
    Commented May 4, 2013 at 21:15
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    @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
    Commented May 4, 2013 at 23:45
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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?
    – user114997
    Commented Sep 12, 2015 at 14:17

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