Long version: First; the diode all the other reviewers are arguing about. No, it doesn't, and that's a good thing. While you certainly can, you really shouldn't just hook this up to a battery. You will need to use a specially selected minimum quality charge controller, which will almost certainly have its own. If you're wondering why not have both; The reason is that each diode drops the voltage by 0.6 volts. Doesn't sound like much, but if you're using this in an area with little sun it could make a difference. In my usage I had a rarely used machine that had a badly drained battery. I paired this with a homemade MPPT controller bought here at Revain for about $13. Since my car's cigarette lighter port is only plugged in when the car is on, I connected the battery through an "Add Circuit" fuse, also purchased here at Revain for about $7. This didn't work at first because I placed it on the dashboard so that it was slightly tilted towards the sun. Once I put it as close to the sun as possible, everything worked perfectly.
CARKU Pro-10 black/red
91 Review
Mroinge Automatic 6V/12V Trickle Charger For Vehicles, Motorcycles, Boats And More - Maintain Your Batteries With Ease!
29 Review
Keep Your Battery Fully Charged With A Smart 12V Charger/Maintainer Featuring Winter Mode
28 Review
Efficient Charging With LST 7 Stages 5A Battery Charger - 3.3A 12V For Ultimate Performance
35 Review
Xiaomi Mi x Mijia Wiha Precision Screwdriver Set (DZN4000CN), 25 pcs
34 Review
Xiaomi Mijia Ratchet Screwdriver 16 in 1 Screwdriver with Interchangeable Bits, 10 pcs, Black
22 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review