I bought this for my Porsche 911 which doesn't drive very often. Interestingly, my 6 month premium battery was actually dead and not holding a charge, BUT what was odd was that this device still showed the battery as fully charged, which is definitely not the case. The only thing I can think of is that the device charges the battery and then once it reaches that threshold, it goes into trickle charge, which explains the meter no longer monitors the battery level in real time (so the battery still charges immediately lose charge recently indicted). If I understood the instructions correctly, I would expect this device to go into "error" mode which alerts the user to some other problem (e.g. a bad battery). Mine never did though, so it just showed the battery fully charged after a few hours, but when I tried to start the car there wasn't enough power to crank it. I was expecting a more reliable Porsche as cheap versions of these only cost around $30.
Keep Your Battery Fully Charged With A Smart 12V Charger/Maintainer Featuring Winter Mode
28 Review
Charger Vympel 57 black
110 Review
Mroinge Automatic 6V/12V Trickle Charger For Vehicles, Motorcycles, Boats And More - Maintain Your Batteries With Ease!
29 Review
CARKU Pro-10 black/red
91 Review
DVR 70MAI Dash Cam Pro Plus+, black (A500S), black
87 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review
Xiaomi Mijia Ratchet Screwdriver 16 in 1 Screwdriver with Interchangeable Bits, 10 pcs, Black
22 Review