# what are the differences between reversible cells and rechargeable cells?

My chemistry textbook says daniel cells are reversible, but not rechargeable. Why is it that all reversible cells are not rechargeable? Are all rechargeable cells reversible? why/why not?

• Good question. I think the reason is essentially degree rather than kind: rechargeable batteries are designed to be discharged and recharged many times, with minimal deterioration in performance. But non-rechargeable cells, such as the Daniell cell, can be reversed but not brought back to nearly original state.
– Ed V
Dec 11 '21 at 15:01
• when I researched a bit more on the internet, I found it is because when Daniel cell is allowed to recharge, reduction of zinc ions to zinc does not take place in the anodic compartment, but evolution of hydrogen takes place. But where did the hydrogen come from? Dec 11 '21 at 15:37
• @AbenPhilip Water contains hydrogen. Dec 11 '21 at 16:06
• Just as Poutnik said. Also, the cell is Daniell, not daniel.
– Ed V
Dec 11 '21 at 16:13
• Moreover reversible has subtle meaning. Often, although not in chemistry, reversible and rechargeable are used as synonyms. Dec 11 '21 at 16:22

I do also, operationally, agree with Aben Philip comments, where apparently, attempting to recharge (aka, chemically reverse) a galvanic cell, may undesirably further introduce hydrogen gas. The problematic $$\ce{H2}$$ gas evolution can result in bursting and the usual safety concerns working with hydrogen (as in an explosion hazard).