I've got four 1.2V rechargeable batteries connected in series to a
TP4056 5V 1A Micro USB 18650 Lithium Battery Charger Module Board X9U4
recharger. The voltage these batteries are supplying when not connected to the Arduino Uno is 4.94V https://drive.google.com/file/d/1E1grrS053dxGHd95uC2tAJg9UiayX--H/view?usp=sharing but the Uno's Vcc is only 3.1V https://drive.google.com/file/d/1fkOOJW46HXQy9OB9MEbbra9qgUpaslw0/view?usp=sharing
why is my voltage drop so bad? the batteries are 1.2V AA rechargeable 3000mAh. they're all identical from the same brand new package and fully charged.
what's going on here? is this the Uno's voltage regulator making my life difficult?