Warning indicates to not attach while the battery is still attached to vehicle. Is anyone using this product while battery is in the vehicle. harm?

As instructed by Mroinge, I disconnected my battery from my car (in storage in my car port) then used this product for 4 months, reconnecting the battery and disconnecting this device every week and starting my car. All went well until I put the car back into service.......issues with the car's computer system. Eventually scrapped the car, only partially for this set of issues. Just bought a more modern car, my mechanic told me to scrap this MBC010 immediately and use a "battery tender" and to never disconnect the battery from the car. So.....this product seems to be entirely misleading in its representation and application. Beware, beware......

the red light keeps flashing. If I wiggle the alligator clamps, the red light will stop flashing but in few minutes, flashing occurs again.

According to instructions a flashing red light means it is not charging. I would make sure you have clean battery terminals or check it on another battery you know is good, if it still flashes red it could be a defective charger. Mine only flashes red when it is not hooked up to a battery.

What is the voltage output?

The voltage output varies depending upon where the charger is in its charge cycle and the state of charge of the battery. The maximum voltage I observed was about 14.2 during the charge and about 13.0 during float /maintain. So this charger should be good for use on AGM batteries, which should not be charged at more than 14.5 v.

Can this charge a battery from zero volts? (A good one that was discharged by say leaving interior light on or something.)

Hi. I can attest that this charger will NOT start charging a fully discharged 12V lead acid battery. I went away for two months and left my 12V battery disconnected from this charger but with a slow drain on my battery. When I returned, my battery was at zero volts, so I reattached this unit to bring it up. It continually flashed red for a full 12 hours and my battery remained at zero. So I connected a 5A booster for under an hour and then my volts increased to just over 7V. I reattached this unit and bingo! The battery has now maintained over 13V. This has been over four months now, and the green light is now on. I have learnt that this unit requires a small feedback voltage from the battery to function. It is a great product. Have had it now over two years and performs very well. I highly recommend as a trickle conditioner/charger.

Manufacturer	Mroinge
Brand	Mroinge
Model	MBC010
Item Weight	5.6 ounces
Product Dimensions	3.45 x 2.29 x 1.3 inches
Item model number	MBC010
Is Discontinued By Manufacturer	No
Manufacturer Part Number	MBC010
Special Features	Multi-level safety protection: spark proof, reverse polarity, overcharging, short-circuit, over temperature, and dust resistance
Amperage	1 Amps
Voltage	12 Volts

Trickle Charger 12V 1000mA Smart Battery Charger & Maintainer and Automatic Float Charger for Motorcycle, ATV, Lawnmowers and More

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