Built-in li-ion battery protection module, battery nominal voltage 3.7v, fully charged 4.2v, Capacity 1500mAh.

All orders are shipped by is in Fox Lake, IL USA

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IMPORTANT - Please Read 

Before replacing the battery please look at the original battery connector/plug and check the polarity of the battery.  Red wire connection is positive " +" . Black is negative "-".  If it is reversed you will need to change the position of the wires in the connector/plug on the new battery.
 

CHANGE THE WIRE POSITION ONLY If the polarity of the wires on the connector/plug in new battery are reversed in comparison to the original battery connector/plug. This is not a problem--NO SOLDERING IS REQUIRED-- you will need to take the wires out of the plastic plug and reverse them. To do this, take the smallest screwdriver or small blade you own, very gently pry up the two plastic tabs on the top of the plug one at a time, and gently pull the wire out of the plastic plug.( Don't yank!).