TC reported battery charge loss at rear M1 car. Staff (YWT) checked and confirmed no abnormalities w ere found. ~~~~~ TC reported battery charge loss at rear     Checked Tims and observed FC-427(APS battery over temperature)Checked #1702 battery bank for signs of leaking or bulging ,no abnormalities observed,satis.Checked battery temperature sticker,no temperature,satis.Checked battery bank voltage,satis.Measured #1702 battery bank temperature sensor resistance,NG.To follow up with battery bank c/o when spare is available  due to faulty temperature sensor. 0020 raise to follow up. Checked by Jun Hong. 22/12/21 To c/o 1702 Battery Bank #1702 checked Tims fault code-multiple occurance of FC 427 Battery over temperature ,FC 426 Battery low voltage.Checked #1702 battery bank-no sign of leaking,bulging,battery temperature sticker no high temperature.Measured batterybank voltage-107vdc satis.Measured #1072 battery bank temperature sensor resistance NG. Battery c/o done for #1702,check Tims,no recurrance of fault.Security check ok. Not: 2342683 raise New s/n: 2016-263 Old s/n: 2016-084 Done by Sanip/Henry. 23/12/21