It's not the money that is the issue...it's all supporting information and manufacturing data that you won't be able to deal with!
Part of the process is to get some base line safety, quality control and responsibility in place for a technology that has some degree of volatility to it.
So unless you want to start digging around with the manufacturers and how they make the cheap cells...and then take responsibility for them in the long term...you really have no hope!
Product certification in all industries is an absolute mine field...although this one will be relatively simple compared to a lot of other consumer/medical/industrial standards, you really won't want to go there! There is a reason cheap cells aren't on that list...and are cheap!
