My 5 year old bike's battery fails to fully charge after say 4 days. After using this charger, the battery will keep a full charge for at least 8 days. Typically, these batteries only last 3 years. The last C-Tek charger I had was an old model and didn't seem to rejuvenate the battery the way it does. I have C-Tek pigtails connected to my cars as I usually leave a charger on them to tidy up their batteries. I can fully recommend this product.
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