I would like to connect two batteries in parallel to service a RF
receiver. Both are Lipo batteries but battery A is high capacity and
main battery whereas battery B is reserve low capacity battery.

The average consumption of the RF receiver is about 2A, battery A is
5A/h and battery B is 1.5A/h.

I do not see an easy way to:

1) have battery A depleted then (and only then)
2) switch to battery B till it is depleted too.

I would assume a large capacitor plus a very fast switching transistor
(IGBT?) may help to make it transparent to the load to a certain
extent.

But perhaps anyone knows a better way to do this. Any help really
appreciated, I wouldn't like to reinvent the wheel but, except for low
current ICs in Maxim, I didn't find anything else doing this already.

TIA

-- 
Ariel Rocholl
Madrid, Spain
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