So charging all last night and most of today, and still not more than 86%. I'll give it a few more days (maybe charge off the display as a test), and then decide if I'll return it or request a replacement.
I just found the following, and it actually explains a lot:
Some past reviews complained of: 1. Charger not working properly 2. Battery remaining indicator doesn't report properly in OSX 3. Battery fit and finish is awful and inconsistent 4. Charger base dies an early life 5. Battery falls out 6. Mouse bluetooth connectivity randomly fails
Of these 6 major complains I can say this: 1. Charger MUST not be placed on the aluminum base of the iMac or a metallic surface. The system works by using inductive charging. Metallic surfaces will completely render the charger useless. Place it on a wood desk and it will charge the battery fine. 2. Normal alkaline/lithium AA batteries operate at 1.5 volts/battery. NiMH and Ni-Cad rechargeables are designed to work at 1.2 volts / battery. This 0.3 volts difference in the cells explains why the battery % indicator in OSX doesn't report 100% charge b/c of this voltage difference. Apple SHOULD allow users of OSX to select the type of battery that is installed in their input devices so that the battery % indicator is more representative of what is the actual life instead of basing on the assumption that battery cell voltage is always 1.5 volts / battery when in a 100% state. 3. Battery fit and finish in fact is excellent on the unit I purchased. The key is to pay close attention to the install. Place the upper portion of the battery into the mouse first and tip the battery into the mouse and engage the locking tab. Press firmly down on the battery further until you can manually move the locking tab into the fully engaged position. Once locked the slight outward pressure of the battery pack will keep it locked in place. I've banged my mouse around deliberately on my desk to make the battery pack disengage and fall out. So far so good. 4. Can't comment on the charger's life expectancy but it does carry a 1 year warranty through Mobee Technologies and if you purchase it on a credit card then your warranty is doubled to 2 years anyways. 5. Please refer to point 3 and FULLY engage the lock tab on the bottom of the mouse. Don't just press fit it in, press firmly and LOCK the tab in place so it fully catches the edge of the lock tab cutout. 6. Can't say that in the few days I've used the mouse that I've lost connectivity. Some reports have said that the connectivity loss is a direct result of the battery falling out. If point 3 is followed then there should be no reason why the mouse would stop communicating with your computer.
Overall after paying very close attention to the fine details of the charger and battery pack I give it a 4 star rating. Pay particular attention as to how the battery should be installed (tuck upper portion of the battery into mouse FIRST and then firmly lock the tab on the bottom. Last but not least don't place the charger on ANY metal surfaces (esp the foot of the iMac base).
Recommendations to improve this product: 1. Include detailed install instructions so that others can't inadvertently try to drop the battery pack into the mouse without first tucking in the upper edge. Common sense isn't so common for some users. 2. Not related to product - Apple OSX needs to revise their battery reporting schema to allow users to tell OSX what type of batteries their using. 3. Price - This unit isn't cheap. Consider that you can buy the equivalent eneloop batteries for HALF the cost to accomplish the same result is a tough sell for some. 4. HAVE a CLEARLY VISIBLE warning to product users to NOT place the charger on metallic surfaces. It simply doesn't work when sitting on metal or the base of the iMac. 5. Include a passthrough USB cable so that it can still be plugged into a computer BUT allow another USB device cable to be plugged into it. 6. Speed up charging times to about 1 hour vs. 6.
I only paid $29 via Amazon, and if — as it appears to be working out thus far — I only need one overnight charge per week, and I get the promised 500 charge cycles (or even close to that), and never have to so much as crack the back cover of the mouse, I'd call that a darn good value. Not a hard sell for me.
Now, if the unit craps out on me in a couple of months or if the charge duration starts to decline… that's a different story. But it's warranted for a full year from the date of purchase.
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