Rechargeable 9V Batteries - High-Performance Lithium-ion Battery 8 Pack with 4-Bay Speed Charger - Leak-Proof Ultra Long-Lasting 8.7 Volt 1300x Cycle Times with a 10-Year Shelf Life

saves a lot of money if you use a lot of guitar pedals

I'm the Superintendent for a large Condominium Complex and I bought 72 of these thinking I was going to be getting a great deal. We check smoke detectors twice a year, installing new batteries when needed. I put all 72 batteries on the charge for 24 hours each and the charger showed them as having green lights, which the instructions say that they are charged.One of my employees got the boxes mixed up as to what was charged versus what was not charged yet and went and put the charged ones back on the charger. As you can see in the picture 3 of the 4 "CHARGED" batteries now show a RED light as uncharged. I tried this with all the ones that I had previously charged and of the 72, 68 of them I had to recharge again.For those 4 batteries that showed fully charged, I had to replace a smoke detector battery. I put that battery in and went to check some other units and about a half hour later the unit owner called me to tell me that the smoke detector was beeping. I had to go to the store and buy expensive Lithium batteries as these weren't working in any of the smoke detectors we put them in.It would have been a great idea and the first review I gave, I was highly pleased. Now, I'm totally not pleased. What a waste of time, energy, and money. They are returning my money when I send them back later today.

7 out of the 8 work just fine. Other 1 just keeps blinking.

I have fully charged these batteries and put them into fire alarm. Worked for a month max. Then charged them again. I would really like to get a refund or get a replacement with better product from Amazon.

all of the rechargeable batteries at full charge say "battery low" and ok only last for a few minutes