The RTL-9876 charger protects the battery but the battery I used also has a protection circuit. I performed a test by allowing the battery to discharge until the circuit stopped working. I measured the voltage from the battery at frequent intervals. Starting with a fully charged voltage of 4.1v, after about 60 hours the voltage had dropped to 3.7v, then at about 70 hours the voltage was at 3.6. Shortly after 70 hours, the battery shut down. No voltage from the battery at all so I think it was the battery's built-in protection circuit. I did a very short charge cycle to turn the battery on again and then measured the voltage at 3.0v. My conclusion is that even though the RTL-9876 charger will shut down at 2.7v, the battery's circuit cut off first.
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