I bought 2 psx1 first one lasted 3 years 2nd one about 48 months . Maybe the psx2 psx3 has better drycells. I called manufacturer told them it would no longer hold a charge and was told 2 year lifespan is average, if it gets constant use it can last 4 or 5. My unit looks brand new the battery replacement is around $90.00 more than the unit. At 2 years though it was great so the people giving these power stations rave reviews remember the manufactures warranty is 12 months after that the battery degrades each year. I loved the unit but will now look for one with a longer warranty.
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