DATAMATH CALCULATOR MUSEUM
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.
|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
|BP2||2*AA||2.4V||TI-2550 II||AC9130 AC9900/E|
|BP3||1*AA||1.2V||TI-2550 III||AC9130A AC9900/E|
|BP5||1*AA||9V||1976-1977: SR-40, TI-30, TI-31, BA
RK1 (Rechargeable Kit introduced 1976)
|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)
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: firstname.lastname@example.org.
© Joerg Woerner, January 13, 2001. No reprints without written permission.