Hi Mohit,

you wrote
>>Please let me know what charging >>current should flow to the battery >>and what value of resistance should >>be used?

in most cases, a 2K2 resistor should be allright.

>>so let me know if this method of >>charging is reliable i.e. the reverse >>current does not flow when the system >>is off?

pls look at the MAX691 datasheet, it should answer you query.