diff --git a/hosts/callisto/default.nix b/hosts/callisto/default.nix
index 7d493bd..cde4ee2 100755
--- a/hosts/callisto/default.nix
+++ b/hosts/callisto/default.nix
@@ -99,6 +99,7 @@
 
   services.udev.extraRules = ''
     KERNEL=="cpu_dma_latency", GROUP="realtime"
+    KERNEL=="macsmc-battery", SUBSYSTEM=="power_supply", ATTR{charge_control_end_threshold}="80", ATTR{charge_control_start_threshold}="70"
   '';
 
   security.pam.loginLimits = [