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Calculator Battery Packs 
 Technology and Repair

Welcome!

Ever wondered what's inside these Battery Packs snapped into the bottom of early pocket calculators, e. g. those made by Texas Instruments?
This site will tell you.

Ever tried to repair such a pack but simply replacing the cells didn't work?
You can
order a replacement circuit for the electronics inside the pack on this site.

Want to know how the circuit inside the battery pack works? Read on...

TI-59
One of the most famous scientific calculators from Texas Instruments

Replacement voltage converter circuit

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