Pete wrote:The old IEEE standard allowed up to 3 degC or 5 degF cell temperature differential under float charge. You should be able to site this to loosen the criterion. I don't recall seeing reference to allowable cell temperature differeneces under load testing in literature. But, you should check the most recent version of the IEEE Standard 450-2002 in case it is addressed.
ow our Thermography acceptance criteria for our station battery banks is <2 degf delta between cells. My problem is that we have no difference in criteria for trickle charge or full load during maintenance testing. Is there an acceptable criteria for battery temperature delta's at full load? It is pretty hard for me to believe that a 2-3 degf delta on a battery at full load is an issue. I understand the need for concern if a 2-3 degf delta is seen on trickle charge. I would like to see it in writing so I can change our acceptance criteria for full load delta T's.