In this video, I monitor the charge of an EGO Power Plus lawnmower with a Kill-a-watt power meter to determine how much is costs to charge the battery. The battery is a 7.5Ah model.
P3 International P4460 Kill A Watt EZ Electricity Usage Monitor (Amazon affiliate)
US: https://amzn.to/2TZa4u4
CA: https://amzn.to/3izkEoe
EGO LM2102SP 21" Self Propelled Lawnmower with 7.5AH Battery & Rapid Charger (Amazon Affiliate)
US: https://amzn.to/2ETe3WH
EGO Playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZPuy5tnx9PzNeSWRifq3_pj