Supply Of 12 V , 7 Ah Sealed Maintenance Free ( Smf ) Lead Acid Rechargeable Battery For Emergency Light Of Ac And Non-Ac Coaches As Per Rdso Specification No. Rdso / Pe / Spec / Ac / 0180-2016 ( Rev. 0 ) . Accepted Make : M / S Exide, M / S Tafe ( Amc O ) , M / S Amar Raja, M / S Hbl Only. As Per Specn. Rdso / Pe / Spec / Ac / 0180-2016 ( Rev. 0 ) [ Warranty Period: 30 Months After Th E Date Of Delivery ]