On 8/31/2014 11:55 PM, Leon wrote:

FWIW, From the Primecell web site concerning Li-Ion batteries

Li-Ion = Lithium Ion rechargeable battery. Single cell = 3.6V empty,
4.1 Volts full

Li-Ion batteries require a special charging system. Other types of
batteries may not be substituted. If your electronic appliance
operates from Li-Ion batteries - it must be replaced with Li-Ion.

Because of the cost and short life span of Li-Ion batteries we receive
many requests to rebuild them. Unfortunately we must refuse to rebuild
Li-Ion batteries at the present time. Li-Ion cells are not readily
available. The single cells that would be required for replacement when
rebuilding a battery are not offered to the open market. They are
controlled by the manufacturers to be used only in approved designs and
by original equipment manufacturers. There are many dealers selling
Li-Ion on eBay - they can only be old cells or removed from equipment.
The cells are only part of the problem. There are charge controls and
safety circuits that must be tested, and properly connected when
replacing the original cells.

A safety circuit PC board is attached to the cells to control
temperature, voltage, and current, flowing to - and from the cells.
Each battery pack is made with a specific circuit that is exclusive to
that specific design. Some batteries have a programmed chip - if the
voltage has been allowed to drop so low as to lose the program, or if we
fail to transfer the data to the new cell stack, the new pack cannot be
charged (Usually found in Laptop applications).