battery tender battery charger plus a must have for any car that isnt used regularly them on everything yet to say whether they are good or not this is the original and it works five stars these are the best battery maintainers on the market five stars i have had two batteries die while being tended to works great i killed my battery playing the stereo and five stars good buy this company makes the best battery tenders ive seen would recommend caution made in china you have to pay 20 to have it replaced under warranty great product easy to use and keeps the battery these are great purchases