9.4.4 Immediately after the dischar

9.4.4 Immediately after the discharge, the battery shall be cooled at a temperature of 0 °C ± 1 °C for a minimum of 20 h or until the temperature of one of the middle cells has reached 0 ºC ± 1 ºC . 9.4.5 At this temperature of 0 °C ± 1 °C, the battery shall be charged at a constant voltage of 14,40 V ± 0,10 V. After 10 min, the charging current Ica shall be recorded. 9.5 Charge retention test 9.5.1 A fully-charged battery (according to 8.2), with its vent plugs firmly in place and a clean dry surface, shall be stored at 40 °C ± 2 °C on open circuit for a time (t) defined in 9.5.3. No connecting clamps or cables shall be attached to the terminals. 9.5.2 After this storage period, the battery shall be submitted, without recharge, to a cranking performance test at –18 °C and a current I = 0,6 Icc.The voltage after 30 s (U30s) shall be recorded. 9.5.3 Storage time – Normal water loss batteries (N) t = 10 days – Low water loss batteries (L) : t = 14 days – Very low water loss batteries (VL) : t = 49 days – Valve regulated batteries (VRLA) : t = 49 days