If you have to have a cordless then consider the Lithium 10 volt model. You'll find the model you listed as lacking in battery run time and power. I have the Lithium model and it still drives me crazy when it runs out and I have to recharge. Every Dremel I buy in the future will have cord on it. If you need one at the field consider a corded model and use an inverter in your vehicle to provide AC power for it.

Ken