+1 on overkill
It might seem a bit overkill at first glance, but the reason that I recommended on BLF the eBay $10 12V/66W LITEON PA-1660-2SA1 is that it was the best deal that I could find on a new top-tier power supply capable of handling the large current pulses demanded by the Opus BT-C3100 when charging 4 cells at 1A (see e.g. HKJ's reviews for graphs). At $10 shipped, it is a great bargain for a new top-tier power supply built on the latest technology (e.g. efficiency level VI). It will run very cool powering the Opus, so it will have a very long life. Further, it will likely prolong the life of the Opus compared to using the supplied overloaded lower-quality SMPS.
As you can see from the 2nd eBay link, the LITEONs have been selling quickly, but the eBay seller still has a handful left, so get 'em while they last. Follow the first BLF link for a long thread with much further discussion on this topic.
Note: LITEON is a top-tier power supply manufacturer employed by many top-tier PC manufacturers, e.g. if you search on "LITEON oem" on eBay you will see power supplies they made for Acer, Apple, Cisco, Dell, Gateway, HP, IBM, Kodak, Lenovo, Samsung, Sony, Toshiba, etc, which should help convince you of their reputation. LITEON (and Delta) are the OEMs for the Apple magsafe power supplies. A top-quality 12V/66W SMPS has many applications for anyone who tinkers with electronics, so it is a good investment.
PS To clarify HKJ's remark that "Opus did reduce the peak enough to work with the power supply they used at that time", it is helpful to add some context from the BLF thread. As I mentioned there, Opus appears to have switched their 12V/3A power supplies from an Asian Power Devices APD WA-36A12U to a KYT120300BV by Shenzen KeyingTong Electronic Tech. Based on reports on BLF, it appears that only the latest KYT supply is hiccuping (rebooting) when the Opus is at full load (though this is probably also greatly stressing the APD too). So if you plan to use the Opus at full load then I highly recommed to upgrade the power supply. This is essential if you have an early Opus version (where the peaks were even larger - up to 12A. - which greatly distorted the calculation of mAh charged).
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