Top critical review
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Replacement battery for late 2008 aluminum unibody Macbook
on October 13, 2013
Update on Dec. 18, 2013:
I am increasing my rating from two to three stars, in light of the fact that Anker has demonstrated excellent customer service. They contacted me today to say the following and to offer me a partial refund or a return for a complete refund:
"please kindly noted that a 6-cell 4400mAh battery (the one you bought is 4200mAh) of a standard volume is designed to drive the computer for about 2 hours. The actual operation time depends on how much electricity is required by the device. The screen size, hard disk and other accessories may consume extra electricity and shorten the operation time."
I am still somewhat disappointed in this replacement battery since the original battery life of my machine was 3-4 hours when I bought it. Since I bought my computer, I have moved to a hard drive that has lower energy consumption and upgraded to an operating system which is supposed to use less energy than what I had before, so if anything I was expecting even better battery life...
Update on Dec. 7, 2013:
Despite receiving a replacement battery from Anker (they have very proactive customer service), I am more or less back to square one with a battery life of only ~2 hours max with a cycle count of only 14 (with the screen brightness on the lowest setting, reading on the internet, only Firefox and Word open). This battery is also more unpredictable in its discharge behavior during the last 15-20% of discharge. With the OEM battery, I could sleep or hibernate the computer with 5% battery left and it would keep the computer's state in memory for days. Now those last 5% aren't sufficient, and when I try to wake up the computer from hibernation it sometimes just has to re-start from scratch. It is disappointing to see that I could not get a significant improvement by moving from the original OEM battery (which had a cycle count of ~1000) to a brand new replacement battery by Anker. YMMV.
Update on Nov. 2, 2013:
Anker reached out to me not long after reading my initial negative review on Amazon. They quickly mailed me a replacement battery, which seems to be working a bit better for me so far. They have excellent customer service! Time will tell if the new battery makes a difference. It's quite possible that my first was a dud.
ORIGINAL REVIEW (Oct. 13, 2013):
I bought this to replace my factory-original laptop battery, which had a charge cycle count of nearly 1000 and had decreased from its initial 3-4 hour life to a dismal 30-45 minutes. This brand new battery at first offered an immediate improvement back to a 3.5-hour battery life for my Macbook, but after about 20 charge cycles it started to lose some of its longevity. I am now at 30 charge cycles, and I can only run 1.5 to 2 hours if I am lucky. YMMV.