I bought one of these for my Extensa 5420, and within the warranty period had gotten it into a state where it wouldn't charge anymore, at all; it stayed at 0%. So I got a replacement under warranty. A few more months and the replacement is in the same state (but the warranty is expired, because it goes from the purchase date, not the date of the replacement being sent). So for me, Lenmar products are highly deprecated after this.
The original battery that came with the laptop is still fine, it just doesn't have enough capacity (GRAPE32 vs. GRAPE34). Guess I just have to try buying it directly from Acer now, since I think all the aftermarket batteries may be the same. I don't understand the cause of this infant mortality but it sure seems to be common.
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