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I cannot answer your question based on experience, but I would think if it were a strap completely encircling the end of the battery it would work, or I had velcro on one of mine,, but the last one, the battery fit into a pocket between wehre the maple nmounts would go.
and for the record I would not put the battery on the thrustline, unless the thrustline is also the centerline of the wing,,

The Velcro should be fine to keep the battery from going forward in flight.  There's not much force in that direction in flight (you can calculate it if you want), but a little nubbin of balsa glued to the fuselage in front should locate it nicely.  The main question is whether that's a good place for the battery.   Is that where it needs to go to get the CG right?

I'm building a Sig Banshee and I want to put the Battery on center with the thrust line so, it has to be into the wing maybe back to the spar. I'm going to build a 1/8" lite ply box and glue it in the wing. The front of the box will be open to slide the battery in and out. My question is about keeping the battery in the box during flight. How hard will the plane try to push the battery out the front of the box during stunts? Would a velcro strap hold it in or should I make some kind of metal strap to hold it in?

Thanks,
MM

One square inch of velcro on the battery will keep it from moving fore or aft. ALWAYS use INDUSTRIAL VELCRO ( available at Home Depot). If I were you, I would make my box open on the left side so that the battery would bear against the back wall of the box. Then you only need a small amount of velcro to locate the battery fore and aft.

The leading edge contributes little to the strength of the wing. Assuming a well built continuous carry through spar (you could always face it with .007 carbon) go ahead and cut the leading edge to accommodate the battery.

But....... Before you go cutting and box making, strap everything on to the fuselage and determine the exact position of the battery such that you can achieve the full range of CofG to permit proper trim.

Do not just locate the motor out at the end of the fuselage if the model will not balance with it there. Shorten the nose if required.

BALANCE IS EVERYTHING !!

Kim.

This is what I used until I lost a battery at the bottom of a loop.  I have since added a strap and another patch of Velcro on the batteries.  It has been fine since. Actually, it makes more sense to put the whole thing on the other side of the fuselage.

Shorten the nose an inch and a half. Mount the battery on an angle on the outside of the fuse so that the back half comes over the top of the wing and the front half falls below the wing. Either use some J bolts or make up some through hooks like we did on our banshee and hold the battery on with rubber bands. Keeps it simple and effective. I'll try to get a few pictures up for you tomorrow of the whole set up.

For those using velcro as hold downs, it's pretty much standard practice around these parts to use velcro straps with a buckle, so the velcro can be cinched down, and then attached to itself. These hold far more load than a simple strip of velcro.

Also I like to put a layer of velcro where the battery contacts the fuselage. This works for 8S 6600mah packs being flung around in snap rolls, and has worked well enough to keep batteries in place after missing the second turn of an outside square. :S

Yes, that's the "type" of battery straps I use.  I call them "seat belts".

this is the setup on my Arctic fox profile! two straps plus vecro With 3 cell battery and eflight ten motor that has more than enough power. The battery is in line with the wing and the battery is 51/4 ' long . flew great