If that's not strong double-sided tape under the battery then you should add another vertical zip tie on it. You don't want the battery to tear loose when the rocket takes off.
On the other side, I'd suggest color coding the connectors using paint, markers or tape on the connector. From the way it looks, you could accidently plug the battery straight into the ejection charge which would be less than ideal. If you move into more complicated DD setups with redundant altimeters this becomes more important, so it's a good idea to start now.
Personally I make both ends of the av-bay removeable, so I'd put JST connectors on the other side as well.
cheers - mark