Originally posted by Jimsi777 You are referring to the memory effect of a battery, this applied to older 'Nickel Cadmium' batteries, the ones we use now doesnt have this memory effect, ours can be charged even when 1/2 discharged without harm ...
Actually, I don't think the member "Antitrust" was referring to that. Lithium, NiMh, and similar batteries, are typically shipped with the internal chemistry in a neutral state to avoid degradation during shipment and while sitting on store shelves. The initial charge after purchase excites the chemistry, with how well that's accomplished impacting overall battery performance. This is why the manufacturers of these battery so strongly stress that first initial charge.
Afterwards, these batteries can indeed tolerate a lot of abuse, including repeated partial discharge/charge cycles without the so-call memory effect. However, this type of usage is not really the ideal for any battery.
The Sanyo eneloop batteries (and similar) are the rare exceptions to all this, not the norm. These are shipped from the factory with the chemistry already excited, therefore less dependent on that the initial charge by consumers. My main concern with these batteries would be how well Sanyo has truly overcome the usual degradation during the time period between the factory and the end consumer.
stewart