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Originally Posted by Kent Walters
Well over a year ago, I was looking for charger design info for non-lithium based batteries, and happened on an article or white paper that considered the pros and cons of poly vs. non-poly lithium ion batteries. That article stated that while the memory issue was not as significant as with non lithium rechargable types of batterys, the poly battery was superior.
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My understanding, based on several sources, is that Lithium-Ion batteries do not have a memory effect.
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* The battery should be charged at least twelve hours when firstly use. It's better to recharge it after its power completely exhausted. Please do the above-mentioned process in the first three times use. [Italics mine; the grammer is original, not mine.]
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I think that's referring to the initial "break in" period only. iRex says basically the same thing, except their recommendation is 5 cycles instead of 3. The reason for the full charge/discharge during initial use is to calibrate the battery meter. It's not because of a memory effect with the battery. Once the initial calibration is complete, you should be able to top off (see the caveat below).
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That comment was aimed at the battery itself, not the DR’s soft/firm ware. The battery meter seems to have a memory effect of its own, and now I’m wondering if the DR had been rushing me to shut down because it only thought it was running out of battery. Oh, my...
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Yes, this is a known problem with Lithium-Ion batteries. Topping off is better for the battery. However, if you do it too much then the meter itself can start to lose calibration. Most places recommend that once every 30 charges, you do a full discharge/recharge. That will bring the meter back into calibration with the battery.
FYI, the software battery meter was not written by iRex. It comes from their third party battery supplier. My point is not to excuse iRex, but to point out that it's a common problem with battery meters.