First MOD is with the 2 fake ys4u battery's. of course this has no real benefit because of the low capacity of the battery's only slight better, but can't wait to get some good battery's to make a battery thats 2000mAh+. The 2.5mm DC has a direct connection to the battery's before the protection circuit, i use a dedicated charger this way. Will correct the pics later for better clarity.