DATAMATH  CALCULATOR  MUSEUM

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.

Type Cells Voltage TI calculators Charger
BP1 3*AA 3.6V SR-50, SR-51 AC9200 AC9900
BP1A 3*AA 3.6V BP1 could be replaced with BP1A
SR-50A, SR51A, SR52, SR56
TI-58, TI-58C, TI-59
AC9130 AC9900/E
AC9131 AC9900/H
BP2 2*AA 2.4V TI-2550 II AC9130 AC9900/E
BP3 1*AA 1.2V TI-2550 III AC9130A AC9900/E
BP4 2*AA 2.4V TI-2550-IV  AC9900/H
BP5 1*AA 9V 1976-1977: SR-40, TI-30, TI-31, BA
RK1 (Rechargeable Kit introduced 1976)
AC9131 AC9900/H
BP6 2*AA 2.4V SR-51-II, TI-57 (1977) AC9131 AC9900/H
BP7 2*AA 9V TI-51-III, TI-55, TI-57 (1978), TI-42 MBA, MBA AC9132 AC9900/R
BP8 2*AA 9V 1978-1981: SR-40, TI-15, TI-30, TI-31, TI-33, TI-41, TI-45, BA, BA1, Money Manager, Programmer
RK2 (Rechargeable Kit introduced 1976), RK3 (European Version)
AC9132 AC9900/R
BP9 2*AA 9V TI-45   
BP200 4*D 4.8V SR-22  AC9222

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

 

horizontal rule

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

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