Kinetik(HC600-BLU) Black Power Cell Battery

Had this in the box for a while and it still had full charge. Fairly well constructed. Perfect size to power a modest audio system in your vehicle with a dual battery setup.

I was skeptical because it is not the battery that causes the dimming entirely, the amplifier draws more amps than some cars can handle. I added a JL Audio HD 750/1 with two JL Audio 10tw3s in my girlfriends car which is small. The lights would dim under heavy load. They barely dim now, the longer the battery is in. If one is not running it under full load, the battery will charge enough to entirely prevent dimming if used moderately. If you are someone who will always go max output, I do not see this being a solution for you. Now, I use a JL Audio HD 1200/1 for my two 12W6s, as well as a JL Audio HD 600/4 for my mids and tweeters in my truck without any dimming issues stock. If you know about JL Audio HDs, they always put out the rated RMS no matter what the ohm resistance is from 1.5-4 ohm. I want to add another set of subs for certain frequencies and will be adding another 600 watts rms. I think I will get one of these to be safe!

Great great battery for music and to help with the lights not to dim when the base hits also came really fast and well packaged definitely recommend 100%

These batteries are great! I replaced my stock 675CCA battery with one of these and it was able to start and run great. I had 2 so I stacked them for additional capacity for the stereo. No light flicker, no issues starting. Also, 2 of these was still 5lbs lighter than my stock battery. Every pound counts right? The only issue I have was with fitment. I didn't expect it to fit directly but I thought they would be a little taller. I had to make a small wood block about 1.5" tall to raise them up a bit so the hold down would actually work. Also I bought SAE terminal adaptors which fit thread wise but I had to take the positive terminal to the grinder at the base to create a single flat edge to clear the plastic next to the terminal.

Brand new in the package fast delivery great product but I had to send it back because I couldn't use it but I'll buy again if need be from this supplier

Works perfectly!!

This is a great battery, this is replacing a identicle battery I've had as a second battery for an audio system installed since 2014. The only reason I need a replacement is not because my current battery died, as it still sits at 12.75 volts. I was installing in new vehicle and dropped the current battery on driveway and the negative terminal is a bit loose. If it wasn't for that, I'd need no replacement.This new battery came resting at a perfect 12.83volts. perfectly healthy and good to go.The reason I see people say these batteries "die" or " are " way low" on voltage after a couple months when used as a secondary battery in an audio system, is because under hood they still have flooded leas acid (wet or regular battery). You can not mix agm and wet batteries, bad the wet batteries sit at a lower voltage, around 12.3-12.5 volts or less. When these are hooked up together in parallel, the front wet battery will drain the rear in an attempt to balance voltage. That's why these don't last in some people's installs.You have to have an agm Underwood as well. It doesn't have to be a kinetic brand, any old agm will do from Duracell, duralast to xs power

This battery helps but my headlights still dim. I'd say this battery took care of 75% of the dimming. Not sure if I should just get a huge battery or buy more of this one. Running about 1000 watts on an oldschool sub amp (probably draws more power than newer amplifiers).UPDATE: After 1 year of use, I'm fairly certain this battery is on its way out. It's not holding a charge for very long anymore. My headlight dimming is almost completely back. Was a good battery while it lasted but I am very disappointed it didn't last longer.