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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 $40 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.
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