TI Classic AA Battery Pack Mod

A number of TI calculators - the Classic series - all used the BP1A battery pack. It held 3 rechargeable NiCad batteries. They lasted a few hours and took all night to recharge with the calculator plugged into a power supply.

The NiCads always eventually die, and TI doesn't sell the packs any more. Rather than live without their favorite TI calculator, some people rebuild the packs with 3 new NiCads. I don't.


Instead, I remodel the packs to use any 3 AA batteries. Then I can use regular Alkalines or modern Lion or NiMH that can be recharged in minutes in smart chargers. I never have to recharge anything in the calculator. If I run out of power I just switch in fresh batteries and go.

If you have a BP1A pack and want me to remodel it:

  • Email me at bobwolfson@gmail.com to let me know

  • I'll reply with my address

  • You can then send me your pack along with $37.50 payment, which includes return US shipping.

  • I'll take checks, or money orders, or if you have a PayPal account you can send payment to bobwolfson@gmail.com

  • Be sure to tell your return mailing address

  • After I've got your pack and payment, I'll remodel it and send it back to you.

More Good News - BP1A Replicas!

People kept contacting me to say that they'd thrown away their dead BP1A packs, and to ask if I had any to sell. I kept on having to send them to eBay to look for a cheap "parts" calculator with a pack.

But now I've made a 3D model of the part of the case I need for remodeling! That adds the cost of printing ($15) to the remodeling charge ($37.50), for a total of $52.50.

So if you've tossed or lost your BP1A pack, contact me and I'll set you up with a replacement!