Great work! First person I showed your site to said "Why didn't I think of that?!", which is always a great sign. If you can compete with or beat most other ea

Great work! First person I showed your site to said "Why didn't I think of that?!", which is always a great sign. If you can compete with or beat most other earphones for battery time, you're already set. Unless you can identify some low hanging fruit, I wouldn't invest much more time into power management because getting Apple-like power management without degrading the connection and user experience is really hard. The two work against each other unless you've got the resources to run large tests to compare changes and perturb towards a solution. I'd recommend focusing on sourcing. The manufacturers who make cells for Apple and auto manufacturers bin their output just like other silicon fabs and only give Apple/automotive customers the best cells (selling the rest to less discerning clients making consumer electronics, ecigs, etc.). On the extreme, I've seen batches of 18650s from the same manufacturer vary from 2Ah to 3.5Ah depending on what quality of Samsung cells they got. You could probably eek out 10-30% more life that way, but it's hard to predict the final outcome during R&D.