I have used numerous 510 batteries and this one is the most reliable

Great shipping time and great product

Fits in my water pipe and functions flawlessly.

Arrived quickly

Love this battery!

Gave me extreme acid reflux and I did not experience any weight loss even with going to the gym 3 days a week and eating healthy. I will not purchase again.

I really like this little battery. And u will to. A+++ seller with super fast shipping. Highly recommend ordering from Heylo. Thank you.

Love these for pain, buying more!!

Very happy with this product took a quarter in the afternoon took another quarter that evening was very happy calm and I slept like a baby. It also dulled my Appetite I kind of forgot about dinner. Look up 2 pounds lighter. I was happy about that.

Very nice product. Extremely functional. It's about time! Hey -yo, I got a cart, Now gotta go, Having fun with my Heylo

Good

Very good experience. Fast shipping.

Helped sore muscles without side-effects.

Great battery, I liked it so much I had to order another. Service and shipping were very fast. Will definitely order again.

Speedy delivery. Excellent battery, one of the best I own.

Works perfectly, better deal than amazon

Nice battery. Seems to last long time. Good indicator for temps. A little large in size, but works well.

It gets pretty hot and has a tendency to burn cartridges after longer hits even at low voltage.