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Nanook
August 8, 2025
Ordered to replace oem JNC660 battery (vendor advises a compatible fit),,, but after installing the charging/charged indicator lights flash variably consistantly so something is not right with this replacement unit advised as compatible
J Hooker
August 2, 2025
I received the battery and installed it in my JNC660. I went to do a full charge and it never really got as high on the voltmeter as the oem battery did. A couple weeks later I went to use it and it didn't work. Charged it up again, and again, low voltage and didn't work the next day. So requested exchange. Replacement was immediately shipped out and received. All is fine now. Easy, no hassle transaction. I'd be happy to buy another battery from these people, and the replacement battery itself seems to work exactly as it should.
Dianne M.
June 3, 2025
Replaced my car jumper battery that lasted from 2016. Only got light use, hopefully this one will last as long. The manufacturer has a new part to fit small change in size of batt. Have used it once since install worked fine. Keeps a good charge but I keep it in the house so easy duty. This was less expensive than the manufacturer suggested replacement. Time will tell.
Georgia Brigand
May 12, 2025
Don't know yet about how long it will last, so I can't comment on longevity. I used this battery to replace a "Chrome Battery" brand which lasted barely over a year.The MightyMax wasn't quite easy to install, but it's not the battery maker's fault. I needed it for a 2000 Honda Shadow VLX, which has the battery compartment hidden below the seat and behind a whole lot of electrical wiring. Connecting the (-) ground lead, in particular, took some time and patience in that tight space.On a bike like my 1999 Kawasaki KLR650, installing the same type battery is a breeze. It all depends on the layout of the motorcycle, not of the battery.Bottom line, the Honda is starting properly again and I hope to get more lifetime out of this battery than I did with the previous one.
Paultro
March 21, 2025
I thought I paid very close attention when I ordered this battery to replace the one in my JNC 770R jumper pack. It was very close but the + and - plates at the end of the cables did not reach the terminals of the battery. Even after some bending, I still needed to make spacers to go in between the plate at the end of the cables and the battery posts themselves. Once installed, seems to be ok. Haven't used it yet but it had 12.8 volts right out of the box. I don't mind doing some custom work to things to save a couple bucks so can't complain. Just wanted to let people know that it's not an exact fit but you can easily make it work.
snogreen
January 15, 2025
Warning. Be careful. I bought this replacement battery for my JNC660. Replacement seeb here is unuseable.. The old battery needs two large threaded screws to connect and lock to battery charger. LOOK at the photo of this Mighty Max replacement. There are two threaded HOLES....but there is NO thread screw with it. So it is impossible to hook up to charge.. The thread screws in my original and dead battery can't be removed. SO this replacement battery is worthless. THEN!!!!! I tried to return it...I am 20 year Amazon customer and I NEVER return stuff, ever. But amazon online request REFUSED me. So next, a 20 minute call with customer service, good luck finding a human...I was forced to get a bit angry and then get a supervisor. FINALLY Amazon agreed to refund my money and told me to keep and recycle the brand new battery...it is too heavy to mail. ONLY BUY THIS BATTERY IF YOU ARE SURE TO HAVE INCLUDED THE TOP TWO THREADED SCREW POSTS...other wise you will be out of luck... and no returns like me.
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