I have had this a few times as it happens.
Not sure if the V70's are all the same or if what worked for mine will work for you. I also tried to charge the battery through the +ive post in the engine bay and using a battery charger. That did not work for me.
What did work was to leave the headlights on and then put 12v via jumper leads directly to the +ive post and the -ive to a good solid ground in the engine compartment. I left it for 5 minutes and then used the key fob in the normal way. You may first have to lock and or unlock the car on the fob once or twice.
No subsequent electrical problems that I know of.
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