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In a "battery of the month club" promotion introduced in the 1960s and abandoned in the early 1990s, RadioShack clients were issued a free wallet-sized cardboard card which entitled the bearer to one free battery a month when presented in RadioShack stores. The free Enercells were individual AA, C or D cells or 9V rectangular transistor radio batteries. Like the free tube testing offered in-store in the early 1970s, this small loss leader drew foot traffic.
There were two editions of a "Enercell Battery Guidebook", published in 1985 and 1990. The selector guide was later moved online. While the "battery of the month" card program ended in the 1990s, the Enercell name remained in use as RadioShack's store brand of dry cells and transistor radio batteries.
RadioShack for several years sold batteries branded "Enercell Plus" that were marketed as "Premium Alkaline" batteries.
- "Radio Shack Grand Opening". Milwaukee Journal (print advertisement). November 24, 1969. p. 8. Retrieved 2016-02-11 – via news.google.com.[dead link]
- Coursey, David (Feb 6, 2015). "Memories of a Radio Shack addict". SiliconANGLE. Retrieved 2016-02-11.
- "Radio Shack Grand Opening". Observer-Reporter (print advertisement). Jan 18, 1973. p. 13. Retrieved 2016-02-11 – via news.google.com.
- "RadioShack's On-Line Battery Guidebook". support.radioshack.com. 2004. Archived from the original on 2012-01-03. Retrieved 2016-02-11.
- "Premium Vs. Standard Batteries: What's The Difference And Which Should I Use?". support.radioShack.com. 2004. Archived from the original on 2015-10-19. Retrieved 2016-02-11.
- Official website(Redirects to the RadioShack website as of 2015)