diff --git a/sys-power/upower/Manifest b/sys-power/upower/Manifest
new file mode 100644
index 0000000..678e6e9
--- /dev/null
+++ b/sys-power/upower/Manifest
@@ -0,0 +1 @@
+DIST .tar.xz 184658 BLAKE2B 740f7c0935c208653bf3c85fe411f6900e22719d71f559f8ac9c0b6a7d574b689010bed56e3cf71a5f4c003c794a26d28a31040a4b70b20ef7170b8911342ed8 SHA512 f2f63c470703b02b3be5f13fd1c0ad2626cfd6a5e27472d7bdcdf6daedb74d78ed8af54e5d103465c6d0cce7dd613a09ffc1b6b6d508eb33eb54c53ba9e967f5
diff --git a/sys-power/upower/upower-0.99.13.ebuild b/sys-power/upower/upower-0.99.13.ebuild
new file mode 100644
index 0000000..49388cd
--- /dev/null
+++ b/sys-power/upower/upower-0.99.13.ebuild
@@ -0,0 +1,99 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit systemd xdg-utils
+
+DESCRIPTION="D-Bus abstraction for enumerating power devices, querying history and statistics"
+HOMEPAGE="https://upower.freedesktop.org/"
+SRC_URI="https://gitlab.freedesktop.org/upower/upower/-/archive/UPOWER_0_99_13/upower-UPOWER_0_99_13.tar.gz -> ${p}.tar.xz"
+# No tarball released at the usual location
+#SRC_URI="https://${PN}.freedesktop.org/releases/${P}.tar.xz"
+
+LICENSE="GPL-2"
+SLOT="0/3" # based on SONAME of libupower-glib.so
+KEYWORDS="~alpha amd64 arm arm64 ~ia64 ~mips ppc ppc64 ~riscv sparc x86"
+
+# gtk-doc files are not available as prebuilt in the tarball
+IUSE="doc +introspection ios selinux"
+
+DEPEND="
+	>=dev-libs/glib-2.38:2
+	sys-apps/dbus:=
+	introspection? ( dev-libs/gobject-introspection:= )
+	kernel_linux? (
+		>=dev-libs/libgudev-236:=
+		virtual/udev
+		ios? (
+			>=app-pda/libimobiledevice-1:=
+			>=app-pda/libplist-2:=
+		)
+	)
+"
+RDEPEND="${DEPEND}
+	selinux? ( sec-policy/selinux-devicekit )
+"
+BDEPEND="
+	app-text/docbook-xsl-stylesheets
+	dev-libs/libxslt
+	>=sys-devel/gettext-0.19.8
+	virtual/pkgconfig
+	doc? ( dev-util/gtk-doc )
+"
+
+QA_MULTILIB_PATHS="usr/lib/${PN}/.*"
+
+DOCS=( AUTHORS HACKING NEWS README )
+
+PATCHES=( "${FILESDIR}/${P}-fix-power_now-energy_rate-readings.patch" ) # bug 796896
+
+src_prepare() {
+	default
+	xdg_environment_reset
+	sed -i -e '/DISABLE_DEPRECATED/d' configure || die
+}
+
+src_configure() {
+	local backend
+
+	if use kernel_linux ; then
+		backend=linux
+	else
+		backend=dummy
+	fi
+
+	local myeconfargs=(
+		--disable-tests
+		--enable-man-pages
+		--libexecdir="${EPREFIX}"/usr/lib/${PN}
+		--localstatedir="${EPREFIX}"/var
+		--with-backend=${backend}
+		--with-systemdsystemunitdir="$(systemd_get_systemunitdir)"
+		--with-systemdutildir="$(systemd_get_utildir)"
+		$(use_enable doc gtk-doc)
+		$(use_enable introspection)
+		$(use_with ios idevice)
+	)
+	econf "${myeconfargs[@]}"
+}
+
+src_install() {
+	default
+	find "${ED}" -type f -name '*.la' -delete || die
+	keepdir /var/lib/upower #383091
+}
+
+pkg_postinst() {
+	if [[ ${REPLACING_VERSIONS} ]] && ver_test ${REPLACING_VERSIONS} -lt 0.99.12; then
+		elog "Support for Logitech Unifying Receiver battery state readout was"
+		elog "removed in version 0.99.12, these devices have been directly"
+		elog "supported by the Linux kernel since version >=3.2."
+		elog
+		elog "Support for CSR devices battery state was removed from udev rules"
+		elog "in version 0.99.12. This concerns the following Logitech products"
+		elog "from the mid 2000s:"
+		elog "Mouse/Dual/Keyboard+Mouse Receiver, Freedom Optical, Elite Duo,"
+		elog "MX700/MX1000, Optical TrackMan, Click! Mouse, Presenter."
+	fi
+}