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Em
Comentado en los Estados Unidos el 4 de enero de 2025
The 9 volt batteries show 9.2+ volts after fully charging. The USB C plug is very nice and it comes with cable to charge all 4 batteries. Hoping this will be cheaper option vs replacing batteries for automotive current clamps and 5V reference box.
Bassema
Comentado en los Estados Unidos el 27 de abril de 2025
It is a good fit it the battery lasted for a good while it is strong power and a cool design and it is too cheap for how good it is
Walter
Comentado en los Estados Unidos el 23 de abril de 2025
does not hold charge for 6 months in standby mode. Battery in ac powered smoke detector lost charge and the back up battery in battery box did not have a charge either. It is not easy for an 80 year old man to change a battery in a stairwell.
Discriminating Buyer in Colorado
Comentado en los Estados Unidos el 22 de diciembre de 2024
I am an Electronic Technician. I have been using 9 volt rechargeable batteries for many years. This brand is the VERY FIRST I have ever owned that reached 9.0 volts! Amazing! All four were higher than 9.0 coming in at 9.26 and one did 9.32. Pretty cool accomplishment. It may not matter to most people but I am sure it will be noticed by many. I did these measurements more than 24 hours after I charged them fully. These come with a single charging cable that will charge up to four at one time. Fun test done: I hooked up a led with an appropriate resistor in series to one of the charged batteries. It stayed lit for 49 hours before it began blinking!! When it was on you could feel VERY slight warmth on the led. That test amazed me. Whatever way they designed this battery was the RIGHT WAY for sure. Off my soapbox.
Stbentoak
Comentado en los Estados Unidos el 25 de septiembre de 2024
The real key is whether they will last. They arrived in good condition and fully charged themselves within about four hours on a USB. Being a lithium battery in a smoke detector we expect them to last at least three to five years. Only time will tell if they actually do, but being able to recharge them is a definite benefit.Update.: They did not last in a smoke detector even 6 months. These are supposed to be "lithium" batteries I'm thinking like 5 plus years. Seriously want my money back.......I thought these would be the last 9 Volt batteries I would ever buy. Well, they are.... the last ones I'll ever buy from this place.....
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