Battery life

We love the Monster Speakers... My husband had a Rockin' Roller 2 and we LOVE it but the handle broke so I wanted to get him an updated version. Bought the Monster Rockin Roller 4, returned it (did not work), then bought then bought him the Monster Rollin Roller 3 and was very happy with it for about 5 months then the battery wouldn't stay charged. So now we can't use it unless close to electric. We still use our 2 and take it everywhere with us.

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