Going global is not a cheap thing to do, and so low cost solutions are rare, and rarely work. You need to find your potential customers, contact them and get them to sign contracts - All things that cost money.
I would suggest finding an investor in order to get the money you need for expending the business. You will loose some equity, but the shares you will retain will be worth a lot more (assuming things work out of course, as there are always risks in every business).
The type of investor you should look for depends on the current value of your company, and the amount of capital you need to raise. If you are small and need a small amount, look for an angel. If you need to raise over $1M, and have a pre-money valuation that is high enough (the amount of money that the company is worth before the investment) then seek a venture capital firm that specializes in relevant technologies (Batteries or related products such as cellphones). Either way, you need a business plan that outlines your plans for the business, how much money you need and where that money is going to take you.
Another potential investor would be a strategic partner, such as a big client or supplier you may have. Your product might compliment theirs, and working together may create greater value for both companies.