Answer from Mufti of Malaysian Federal Territory:
Originally, anything that belongs to a mosque is a wakaf (waqf) from the donation made by the public. Thus, the usage of the mosque’s assets which also includes electricity depends on the intention of the donators.
An Islamic legal maxim states (which means):
“Anyone who is involved in dealings on behalf of others, then his actions must be in accordance with the maslahah (the greater good)” (1/310)
In this issue, former Grand Mufti of Egypt, Dr. Ali Jum’ah emphasized, according to fiqh, everything that is donated as wakaf (waqf) to a mosque, such as the carpets, light, broom, water, and others, it is impermissible to be used except for the use of the mosque. This is in accordance with the actions of the Prophet (Peace Be Upon Him) who are cautious in everything that is specified for the mosque. The Prophet PBUH said (which means):
“The gravels adjure the person when removes them from the mosque.” [Narrated by Sunan Abu Daud (no. 460)
In the issue of charging our personal gadget or laptop, the original ruling is, it is permissible if it is used for beneficial and good deeds such as reciting the Quran, learning, and desperate situations such as to contact one’s family members and others.
However, if it is used for transgressions and purposeless matters, then it is impermissible, for it contradicts the main purpose of the mosque’s assets which is to be of benefit.
Furthermore, it is sunnah for those who benefit from mosque’s assets to donate to the mosque’s fund to help the mosque’s management to pay the costs incurred for the maintenance of the mosque to benefit us all. Wallahua’lam.
Taken with slight changes from https://muftiwp.gov.my/en/artikel/al-kafi-li-al-fatawi/2467-al-kafi-760-charging-personal-gadgets-in-mosque?highlight=Wzc2MF0=&fbclid=IwAR2_m9SG_djy18z9Rzx0DxFHydGZaax21Q7gaZwqQFcOtXg9zFBZOdtKPGc
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