Your picture is for a 8.4 Volt Box, the charging module is for 4.2 Volt
are you sure you want 8.4 Volt?

EDIT
for 4.2 Volt you can do it like this
http://breaktru.com/smf/index.php/topic,616.msg16987.html#msg16987

the output from the charging module is connected to the batteries plus to plus / minus to minus