The amazon knock offs of the ego+ batteries are legit and 1/3 the cost if you need an extra.Well, after 3.5 years of no maintenance and no issues, i finally had one with my EGO mower. Well, really just the battery. 1 battery seems to have gone bad (just a few months after the 3-year warranty is up of course). Charger says it's fully charged. Put it in the mower and it last all of a couple seconds before mower says "battery is dead" with the red light and stops. I have a 2nd battery which works fine so i know it's the 1 battery and not the mower. Bought a new battery today but holy crap they're expensive ($250!). Any ideas for this bad battery?