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Now, when it comes to rechargeable batteries there are a lot of variations batteries is that, from the day they're manufactured. they start to lose their ability to hold the charge. Although the rate is small (depending on the type) but even without you having to do a Calibration (more later), still at the end they'll all gonna lose invented around 1899 by Waldemar Jungner (Swedish). There was single main disadvantage that NiCd had from the beginning. Let me give you an With a NiCd battery, say that you usually let it discharge about 20-25% and then do a full (100%) charge, then as the time goes on NiCd cells will forget about the remaining 20-25% capacity that it can hold thus resulting a charge hold of 70-75% (as per this example, otherwise the numbers will change) of it's full capacity. This loss of the battery's memory is called MEMORY EFFECT.   So in another words, as the time goes on NiCd (and its other variations) loses its ability to measure or caliber it's charge-holding capability thus requiring us to do a manual battery Calibration!, to help the dumb battery to get its memory back :P. But remember, the above phenomenon does not occur due to the fact of excessive battery discharging but it comes into its existence due to Lithium-ion or Li-ion batteries are the current most popular types of rechargeable batteries used by electronic gadget manufactures. Unlike with NiCd, Li-ion does not have the notorious Memory Effect. They are more efficient, smaller in size, low cost,. they have their Even though they don't have the memory effect issue, still they have a phenomenon called SOC mismatch. > Li-Ion batteries require a Battery Management System to prevent > operation outside each cell's Safe Operating Area (over-charge, > under-charge, safe temperature range) and to balance cells to > eliminate SOC mismatches, significantly improving battery efficiency > each problem limits pack capacity (mA·h) to the capacity of the > weakest cell. Source: Wikipedia