The flashing "V" on the screen indicates that it has entered maintenance mode.
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Battery Tender Charge N Start 1120 1A Battery Charger & 1200A Jump Starter
Schumacher 6V/12V 1A Battery Charger Maintainer SC1586 Automatic Multi-Stage
1A-10A Battery Charger 6V 12V Smart Trickle Charger Automatic Battery Maintainer
