When opening the pronto, make sure that you check close to the motor for more cells, depending on the model and voltage you may have a few more away from the ones in the handle...
Mine has 6 cells, 4 in the handle and 2 on the sides of the motor. I'm not certain, but I don't believe there is a model with only 4 cells. Replacing only a few cells would help, but isn't a long term fix
SOURCE: Battery for electrolux pronto stick vac 2 in 1
The battery replacement for the PRONTO is not a consumer level maintenance procedure.
However, I just replaced the 4 original EMX1600sS batteries by anotther model with the same specs and my PRONTO is working fine now. The battery model is
Tenergy 2/3A Size Rechargeable Battery 1.2V 1600mAh NiMH W/ Tabs
Those are a little smaller than the originals but with the same capacity of 1600mAh and can be easily found in the web.
There are other similar models available that could be used but have in mind the limitations for the dimensions and capacity in mAh.
The dimensions of the original cylindrical batteries are aprox. 33 mm (1 1/4") X 22mm (7/8").
Anything under those specs should work.
Good luck.
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