ORIGINAL: spiral_72
I'd disagree with others here. If your packs are both 4.8V 750mA and you connect them with a y-cable it's exactly the same thing as having a sealed 4.8V 1500mA pack..... The y-cable connects all the cells in exactly the same as you COULD inside a sealed pack. The charger won't know and doesn't care, you're the only one that knows it's two seperate packs.
We do it all the time when we discharge onboard a plane! Two smaller packs on a y-cable, equals the same double capacity pack.
I wouldn't do it on two packs of different capacity however.
Yea, you can cut up the y-cable and charge at 9.6V 750mA, but why sacrafice the cable? It'll work exactly the same.
Unfortuneately you are very wrong on this. You can not REPEAT CAN NOT charge either NiMh or NiCad in parallel due to the nature of their construction. One will always hog the current and overcharge. You can charge LiPo's or Pb based cells in parallel however.