Both my batteries packed it in during the current cold snap at -40c in saskatoon. I bought two Platinum 24C 1000 CCA (Battery Direct LTD Part# P2484) they fit exactly as the original. I have used the platinums in three other vehs and I love them. They are pricy but they have a five year replacement plan. I put the new batteries in last night and this morning when i started my truck the difference was incredible. The same was noticed at work after sitting for eight hours at -38C with a oil pan heater.

1991 LWB Exceed Q-V44WG RPF 4D56/V4AW2/5285
2005 Ford Excursion 6.0L Diesel