2.5 GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.1 GHz) with 3 MB shared L3 cache.

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Need to change the backup battery.

Since a few weeks, date and time are lost when battery runs dry. I know older models had a backup battery to keep some power while main battery was recharged. Where is it, and which is the model of the required cell batt?

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There is no PRAM battery on this machine. That function is taken care of by a small capacitor on the logic board. Sounds like yours has failed or it has been left with out a charge from the battery long enough for it to dissipate, I'd keep the main battery charged up or replace it if it;s bad.

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