BP - Battery Packs

The first Texas Instruments calculator, the Datamath, used rechargeable NiCd (nickel-cadmium) batteries. They were soldered together and firmly mounted inside the calculator housing. Later the people at TI changed the housing and added a trap door. From this time customers could either use standard AA-cells or rechargeable batteries of the same size.

Starting with the SR-50 Texas Instruments introduced so called "Battery Packs" or BP's. The technique used inside these removable BP's changed over the time from a simple battery holder to a module with integrated electronic to charge the battery and lift the voltage of one or two cells to a more common 9V voltage.

Although most of the BP's look very similar they are not compatible. Here is a list to give a reference from a BP to the possible TI calculator and the associated Charger (US and European models). 

Don't miss this link: Repair a Battery Pack.

 Fineprint: This list was compiled carefully but we are not responsible if someone destroys his calculator due to informations of it.

If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, January 13, 2001. No reprints without written permission.