diff --git a/docs/Battery.md b/docs/Battery.md
index 5e5822e24c..b3c0d63ba3 100644
--- a/docs/Battery.md
+++ b/docs/Battery.md
@@ -167,7 +167,7 @@ For example, assuming:
 
 Then the updated `amperage_meter_scale` is:
 ```
-amperage_meter_scale = old_amperage_meter_scale * (charging_data_mAh / reported_draw_mAh)
+amperage_meter_scale = old_amperage_meter_scale * (reported_draw_mAh / charging_data_mAh)
                     = 400 * (1158 / 1260)
                     = 368
 ```