Replace with Alkaline: You do not need an HP adapter charger anymore. Very nice, just swap out with a new set of AAA batteries. The AAA batteries last with the "all-8s" display for about 8 hours. I have used this battery pack with my HP-67 and it works great. Generally AAA alkaline cells are rated around 1000 maH. The original AA rechargeable Classic HP battery was rated at 450 maH.
I've had several emails asking if the voltages of alkaline cells at 1.5 volts may be too high compared to the 1.2 volts generally peaking for rechargeable battery cells. Several years ago the HP Calculator Museum forum group discussed this issue. They concluded that alkaline voltages are not harmful to the internal HP Classic series calculators. Charging voltages peak to 5 volts (within the adapters) and so the AAA alkaline batteries will not harm the internal circuitry. Just so you know, I have used them for a few years on my collection of HP-35, 45, 55, 65, 67, and 80 calculators with no issues at all. The AAA cells work very well.
Shipping: Shipping costs are listed below. For multiple battery pack purchases contact me for actual shipping costs. I will refund your extra shipping charges and only charge you actual shipping costs. .
BTW, 93.9 percent of my sales go out on 1 day.
Also check my other HP calculator battery packs for sale especially for the Spice HP 33-34-35 calculators and for the larger HP 95-97 calculators.