GENIUS1: 1A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – For Lead-Acid & Lithium Batteries

Works extremely well. Does the job easily and it’s small and portable. Great value for money. Highly recommend this charger.

Battery on my caravan had dropped over winter slightly and hadn't got enough charge to use the motor mover. Put the battery on charge for 48hrs and it was fully charged. Great bit of kit would recommend

Had to send the first charger back as it was defective, displaying red and green flashing LEDs alternately, before shutting down after a few minutes. The item had arrived unsealed and with tears to the packaging so it seems as it had been returned as defective before being sent out to me. The replacement arrived the next day, properly sealed, and I set it up in my camper. It worked exactly as it should and is now keeping the starting battery topped up.

Good piece of kit, does the job brilliantly

This arrived in 24hrs - seller is to notch 5 star business. This is my 4th Genius - they are superb. Cannot fault quality and ease of use. 10/10

Brilliant device, gently recharged a completely flat battery, reminding us how important a trickle charge is!

Needed one of these to keep my bike battery topped up after finding battery discharged yet again after a couple of weeks standing unused. Unit plugs into mains directly and has around 6ft cable with connecting plug on other end. The other cable has crocodile clips on it which can be removed exposing two eyes that connect directly to the battery. It's a pain to access the battery on my bike so I chose this method. This 2nd cable is around 18 inches long and required routing to find an easily accessible dry and clean place for connecting to main lead. You can buy longer cables if needed. No instructions in box. Go online and find them. Not the simplest to understand but main thing is know your battery type, ie. agm, lead acid. All up and running very happy so far. Observed it going through it's different phases and now has steady green light. Update: Unit developed a fault shortly after install following a very promising start. Made contact with Noco technical support who agreed that the unit was faulty and helpfully offered to assist with my return. Not required as Amazon returns process is excellent. Ordered the same as a replacement on the assumption that I can't be unlucky twice. New unit arrived next day and works (so far) as it should.

I have had 3 of these now (2 replacements for faulty ones). Maybe I'm unlucky, but I've had 3 these that start off OK, but after a short while (a couple of weeks) fail to charge. The red LED pulses, but never goes green. I tried on 4 different batteries, all of which show as fully charged and good on other chargers, and have been tested and proven good batteries (1 was brand new!). The charger doesn't even seem to be trickle charging. This charger was used on my motorbike over winter, so keeping the battery topped-up is important, but they seem to fail after a short while. I have gone back to my old Motopower charger, which seems to have no problems.