sealed AGM and gel cell battery voltage (fully charged) will be slightly higher in the 12.8 to 12.9 range. So yes a minimum of 36 but actually more like 38-39 volts. Check your charger instructions and make sure there is not a plug that needs removed or installed so your charger will realize you are using AGM's, they have a different charge sequence than reqular flooded cell batteries do. You could check the motor itself by plugging in your battery charger, then quickly depress the foot switch to see if you get any blade rotation.