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How can I fix my Bison 50 stair lift?

I replaced the charging unit for my Bison 50 stair lift (with a third party 33V 1A switching transformer from another stair lift) and replaced the battery packs. When powered up, the display under the seat alternates between S and r and the batteries shortly went dead. Any thoughts on what is wrong?
Cam Tait, November 2024
link Click here to see other fixes for Bison 50.