The TR-838 Battery Attachment Tool is used to mechanically attach TR-830 batteries to the TR-802N Intrinsically Safe (IS) PAPR blower motor as required by the most current UL standard (8th edition UL 913) for Intrinsically Safe PAPRs.The TR 838 Battery Attachment Tool is used to mechanically attach TR 830 batteries to the TR 802N Intrinsically Safe (IS) PAPR blower motor as required by the most current UL standard (8th edition UL 913) for Intrinsically Safe PAPRs.