Battery Tender 021-0128-AAA Plus Charger/Maintainer

• Charges and maintains the battery at 100 percent state of charge
• Plugs into any wall outlet
• Prolongs the life of the battery for 2-4 times normal life
• Easy to install with ring terminals or alligator clips with a quick disconnect for easy in and out charging
• Temperature compensated, reliable and durable

The unit seems to have charged my parked car battery and got to a solid green (charged) status after about two days. Yesterday I noticed it was on solid red which means too low to be charged. No idea what the story is here.

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