Bridge Building challenge

We were tasked to build a bridge out of coffee stirrers. We were supposed to do only four parallel at the in one spot we decided to challenge our selves and only do three. The bridge could only weigh 50 grams. The bridge should support as much weight as possible and the unit of measurement would be AA batteries. Our bridge initially held 505 batteries and almost collapsed but something weird happened that nobody expected. The actual box holding the batteries broke right as the bridge was getting to the point of collapsing. We pinpointed a weak point  and by adding one tooth peak to support it we where able to hold 600 batteries.

First bridge

As you can see upper left corner bending extremely

So the final weight of our bridge was 48 grams which gets you a ratio of 12.5 batteries for each gram so its a ratio of 12.5:1 Batteries:grams