These two did not seem to have all that much usefulness. One hardly lasted at all, one is still going but not a lot of reserve power. Also there was a problem with the height of the charge connection, I shimmed the unit up just a bit and it started to have some success after it was "fixed".PS I know to take good care of the batteries, I have gone through many years worth of batteries. See my review on https://www.amazon.com/gp/product/B07DGC1YNC/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 That is a much better deal
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