This extra internal battery helps retain the memory of the waypoints you've entered into your device. The Lithium battery may not be used to operate the GPS device. There are a number of GPS hardware and software products that can work with your portable computer or Palm device. If you're seeking compactness and focused functionality, standalone handheld GPS devices may be just what you're looking for. Please let us know.
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Not all accessories pictured are included. Not responsible for typographical errors.