I offer a replacement voltage converter circuit that fits Texas Instruments BP-7, BP-8, and BP-9.
It comes as complete printed circuit board that can be easily mounted into an existing Battery Pack. You will need a mechanically intact BP to install it and
a working original AC adapter to charge it.
Unit price is EUR 28 or $ 35.
Shipping and handling is EUR 4 for orders from Germany, and EUR 6 or $ 8 for international orders.
Volume discounts are available upon request.
Payment is easy through PayPal.
To order, simply send me an email.