ZPower has developed proprietary, silver-zinc microbatteries that offer higher energy density values than any other battery within the same volume range (< 250 mm3).
Today, ZPower microbatteries have an energy density of approximately 340 watthours per liter (Wh/L) at a size of 156 mm3.Their cell’s energy density remains high, between 320 and 370 Wh/L, even as the battery’s volume changes.
HIGHER ENERGY DENSITY Li-ion batteries maintain competitive energy densities at volumes above 625 mm3, which is four times greater than the size of the XR41 silver-zinc battery with the equivalent energy density.
But as the Li-ion cell shrinks to microbattery size, inherent constraints in the ‘jellyroll’ implementation of the electrodes (smaller electrode widths, fixed separator thicknesses, shrinking jelly-roll diameters, and the volume lost in the center of cell due to the winding mandrel) all limit the amount of active material that can be placed in the cell; lowering the cell’s capacity.
Coupled with the significantly lower current density of the Li-ion electrodes (electrical current per unit area of electrode interface space), the Li-ion cell’s performance scales down dramatically with size.
Joe Z. From Eden Prairie, MN. –
These are getting hard to find. HearSource had them and when I talked to them about it, they knew exactly what I needed. The order was received in a timely manner and without issue.
Henry A. From McCandless, PA. –
My local dealer said these batteries were no longer available. Went online and found HearSource. Bang. Had them in two days. Thank you HearSource.
Martha S. From Poway, CA. –
It was nice to find the exact batteries that came with my rechargeable hearing aids.
Kurt W. from Murphysboro, IL –
I love this rechargeable battery system on Widex hearing aids. I have used them for about a year and a half. I have coupled these batteries with the Widex Perfect Dry Battery charger. They work great together. I have had to replace them once in about a year. Hence the 4-star rating. HearSource has been easy to work with and they did exchange them (actually just sent me a new set) under warranty and at no cost to me.