Tenders for Supply of 4.5 Kw Underslung Constant Voltage, Regulated Cum Emergency Battery Charger For Lhb Coaches.. 4.5 Kw Underslung Constant Voltage, Regulated Cum Emergency Battery Charger For Lhb Coach Es, Confirming To Rdso Specification No. Rdso/Pe/Spec/Ac/0183 Rev 1 -2018, Suitable For Use In Lhb Type Eog/Hog Coaches.