Welcome to the forums, newcomer!
Why would you want to set the custom charge to that range? ideally you're supposed to discharge the battery to 10% before you recharge it to 100% in order to ensure that the battery is being cycled. I've repaired a number of laptops whereby the battery needed replacing because they weren't discharged or recharged properly, read, that the charger was plugged in. I'd suggest leaving things on default.