Juice and strength for my blood pressure meter

It was a pity: the batteries that supposedly full tank came from the charger, power did not have enough to inflate the cuff of the blood Jerk meter. A tired hiss and ERROR on display.
My husband pointed out to me that there are now new batteries that are much more durable than the ones I've used so far.
I ordered these batteries immediately and they were delivered quickly. Unpacked, and used the machine purring contentedly.