battstat-applet use many GB of RAM

[efa]

after some hours of notebook power on, the:
/usr/lib/mate-applets/battstat-applet
use 1 GB of virtual memory, and already 300 MB of RAM.

If I leave the notebook on for some days, it use many GB of RAM in total.
Why the applets do not save battery statistics to a file?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mate-applets 1.20.1-3
ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: MATE
Date: Sun Mar 10 10:46:43 2019
InstallationDate: Installed on 2016-12-01 (829 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: mate-applets
UpgradeStatus: Upgraded to bionic on 2018-09-23 (167 days ago)