Replacement memory card that provides 4mb memory for the CSI 2120 Data Collector Test Set. 1 SRAM PC card with 8KB attribute memory and is designed with dual backup battery - a removable (replaceable) but non-rechargeable 3V lithium battery (primary battery) and an on-board rechargeable but non-replaceable battery (secondary battery) for data retention. This design allows the replacement of primary battery without data loss. The digital signals will alarm the user the need of primary battery replacement. The write protect switch on the SRAM PC card provides protection from inadvertent erasure.