Too soon to tell
Buy.com had the best price for this known brand of APC compatible battery. It arrived quickly and was well packaged. The included documentation was excellent for those who have not changed these types before. I charged it overnight and the UPS performed a self test properly and maintained my computer system on backup for a few minutes. I did not let the UPS run down. I rated Performance a 4 only because its too early to tell how well it will perform when needed.
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