Is the battery inserted correctly?
Check that the battery is inserted correctly. If it is, check that the battery has sufficient charge remaining.
Also, for RJ-4230B-L / RJ-4250WB-L, the insulated sheet should be removed before installing the battery.
To learn how to install the battery, see "How to install the rechargeable Li-ion battery".
To learn how to charge the battery, see "How to charge the rechargeable Li-ion battery".