I bought these for use on my guitar sustainer which can eat a brand new Alkaline battery in less than 6 hours. They provide lower voltage, about 8.1 to 8.3 on a full charge, but provide almost twice the current or amperage of an Alkaline. Also, these probably won't leak if left in and forgotten like an alkaline These would probably work very well in a wireless Mic as well. A great characteristic of Li-On battery is that they pretty much provide level voltage supply until the battery is empty, then the voltage falls off sharply . Normal alkaline and NiCad or NiMh batteries experience both reduced voltage and current while discharging.. Long story short, you'll save a ton of money over buying alkaline batteries... these should be good for a solid 400 charges, up to about 800 charges with diminished capacity.. think about what 400 alkaline batteries would cost!Read full review
Verified purchase: Yes | Condition: New
2 of the 4 batteries died, won't take a charge, the other 2 are working fine. I use these for my bass guitar and they died on me. Thankfully I had the other set charged and ready to go. Tried to charge them but to no avail.
Verified purchase: Yes | Condition: New
A must have if you use 9VDC batteries. Keep in mind the max voltage is 8.4VDC. This is normal for this type of rechargeable battery. Should not be an issue for most applications.
Verified purchase: Yes | Condition: New
Functional, but just barely. Full charge voltage is less than 8 volts which is barely adequate to operate my stuff. Furthermore the so-called charger came with a cable but no power supply. That's two strikes, one more and I'll be sending it back.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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