here is my take on tenders, if your trying to fix bad batteries good luck, if you use it from the start on new batteries then maybe. using some sort of maintenance charger for batteries that are sitting idol that length of time is best. the stock chargers stay off for something like 16 days then turn back on this is great if the pack is new, older batteries are getting lower every day and could use a pick me up. Just don't expect them to become new again.
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