What's the Non-Correctable Battery Problems(1)?

What's the Non-Correctable <A href="http://www.abatteryweb.com">Battery </A>Problems(1)?
NiCd and NiMH <A href="http://www.abatteryweb.com">battery </A>chemistries exhibit a high level of self-discharge. If left on the shelf, a new NiCd loses about 10 percent of its capacity in the first 24 hours after being removed from the charger. The rate of self-discharge settles to about 10 percent per month afterwards. At a higher temperature, the self-discharge rate increases substantially. As a rule, the rate of self-discharge doubles with every 10¡ãC (18¡ãF) increase in temperature. The self-discharge of the NiMH is about 30 percent higher than that of the NiCd.
A major contributor to high self-discharge on nickel and lead-based <A href="http://www.abatteryweb.com">batteries </A>is a high cycle count and/or old age. With increased cycles, the battery plates tend to swell. Once enlarged, the plates press more firmly against the delicate separator, resulting in increased self-discharge. This is common in aging NiCd and NiMH <A href="http://www.abatteryweb.com">batteries </A>but can also be seen in lead acid systems.
Loading less active materials on the plates can reduce the plate swelling on nickel-based <A href="http://www.abatteryweb.com">batteries</A>. This improves expansion and contraction while charging and discharging. In addition, the load characteristic is enhanced and the cycle life prolonged. The downside is lower capacity.
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