EBL9V Li-ion Rechargeable Batteries (2PC) and Smart 9V Battery Charger

Excellent....!

A few months earlier I had purchased the 4 battery kit that came with a 4 slot charger, and recently needed an additional 2 batteries. Furthermore, I also wanted an additional smaller charger that would take up less space in my bag, thus I purchased this kit. The batteries are the same, thus you get the same benefits of a direct output from 2 3.7V (4.2V full charge) li-ion pouch cells wired in series for an 8.4V output. As with the nature of this setup, you will not reach a true 9V output but since most products that use these batteries can work down to the 6V range, you can still enjoy pretty much all of the capacity these batteries have to offer.Compared to quality alkaline 9V batteries, these have a higher capacity at 600mAh rather than the 450mAh that you would get from expensive premium alkaline 9V batteries, thus if your device can operate down to at least 7V then you will get a longer run time from these batteries.If your device needs a higher voltage where it cannot make full use of the capacity of these batteries, then I recommend looking into 9V rechargeables that use a single 3.7V cell and a DC to DC boost converter. Those will offer a fixed 9V output until the battery is drained to its minimum voltage. While it will mean that your device will not be able to estimate the battery level or warn of a low battery, those will give a longer run time for devices with a higher minimum voltage requirement. The only downside is if the device that needs a higher voltage, also works with any kind of audio capture or analog audio output (that isn’t a basic beep or set of tones), then a DC to DC boost converter will introduce noise into the audio (thus not recommended for any musical instruments, mics, or anything dealing with audio in general).The size of the 9V batteries are within the size limitations of the IEC 9V battery standards, with a height (including the terminals) of 47.9mm, width of 26.14mm, and depth of 16.78mm. In my review I included a diagram detailing the measurements I took with some calipers.One thing to keep in mind is that the operating range of a alkaline 9V battery is 9.5V to 5V, thus if a device has a battery gauge built in and can operate down to 5V then the battery gauge will be completely inaccurate with these rechargeable batteries.Pros:Direct battery output with no DC to DC regulators to introduce line noise into a circuit.More capacity than a quality alkaline 9V battery.No DC to DC switching noise (no DC to DC regulator), thus great for audio equipment.Cons:Lower fully charged voltage of 8.4V compared to a fresh alkaline 9V battery.Devices with a battery gauge that are designed for alkaline battery use will be inaccurate with these batteries. If you need to rely on the battery gauge of a device, then monitor at which point of the battery gauge the device shuts off so that you will know how it correlated to the rechargeable battery.

Great battery and good seller

We have used these before in our In Ear Shure systems and wireless mics. Beware these batteries do not charge to a full 9v. It is stated. Our wireless mics do not show full when inserted fully charged. They do last for a show because of the 650 mAh. Overall I recommend them.

Nice product

Great products, definitely handy in an emergency. Make sure to get these for your smoke detectors.

Purchased this based on other reviews for use on a tens unit. The IF mode drains the battery so you would have to change it out every day.! These rechargeable batteries work great

Good!