I thought it was an alternative power source. Quality and processing are fine. Snaps into place smoothly and easily, just like the original Baofeng battery. I have four UV5Rs and it fits all four perfectly. One reviewer complained about the battery door not staying closed - mine closes securely and it actually takes a bit of effort to open, which is good so I don't have to worry about it falling apart. Another reviewer complained that it didn't include a dummy battery, which is only needed if you plan on using regular non-rechargeable batteries. I have no complaints at all. I actually only ordered one due to mixed reviews but after checking the quality I plan to buy 3 more for the rest of the radios.
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