There is no problem with recharging after 2 months but this is not necessary. No major manufacturer insists on this, some allowing storage of over one year. A few cycles of conditioning my be needed after prolonged storage.
Only true of some types, the Sanyo Twicell being one. With those, some repeated recharge cycles will recover the capacity as you describe, but why go through that when it can be avoided?
With others there is a real risk of failure as I've described and having lost batteries in that way, I personally know that to be true.
This is from Battery University:
"High maintenance - nickel-metal hydride requires regular full discharge to prevent crystalline formation. nickel-cadmium should be exercised once a month, nickel-metal-hydride once in every 3 months."
and this from Powerstream:
"Generally speaking, a loss of voltage and capacity of batteries due to self-discharge during storage is unavoidable. The factors inducing this self-discharge of Nickel-Metal Hydride batteries is listed below:
1. The inside of the cell is a hydrogen atmosphere at low pressure, which gradually reduces the active materials at the positive electrode, resulting in a drop of cell capacity. Accompanied by this, the negative electrode which is thermodynamically unstable in its charged state gradually gives off hydrogen gas, thus reducing cell capacity.
2. The active materials at the positive electrode in its charged state self-decompose, causing the cell capacity to decrease.
3. Impurities within the cell, especially nitric ions, are reduced at the negative electrode and diffuse to the positive electrode where they are oxidized. This results in a lowered cell capacity."
Which way owners follow is up to them, but my advice is risk free.
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