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1. you can gain access to your memory card and its files/contents, by using a computer card reader appropriate for your SD card's size/type. (True 'SD' cards come in three main types:
- SD (original): up to about 4 GB capacity. The SD card that was used first.
- SDHC, and SDXC: larger, to much larger. Advanced SD cards not always readable in every reader.
Such a card reader can be added to any computer without one, for about $10 to $20 in cost, plus a very easy install procedure.
2. you can fully charge your new battery, and that may support the card reader function (which takes a little extra power.)
The replacement battery needs to be charged up for 6+ hours before its first use, owing to its having been on a shelf for a considerable time.
It may read, at first usage out of the package, as if it were fully charged - but it isn't. Leave it 'on charge' for 6+ hours no matter what it reads. Then try to use it.