Review on Long-Lasting EBL 9V Lithium Rechargeable Batteries With USB 5400MWh Capacity (Pack Of 2) by Freddy Hammonds

These are claimed at 5400mW/hr capacity which translates to about 700mA/hr so should be fine for most low power applications requiring limited attention over long periods. Mine actually have a fully charged terminal voltage of 9.16v which is very good for Lithium Iron. They also come with a nifty built in mini USB port for use with ubiquitous standard USB wall chargers.There is however a problem. The internal switching voltage inverter which creates the >9v output and allows this simple recharge feature generates RF interference. This means it can interfere with radio receivers nearby and can create audible noise in applications such as wireless speakers, portable music players and guitar pedals.I bought these for my guitar pedals but the generated noise made some of them useless. However with a terminal voltage of 9.16v they should work fine in flashlights, smoke detectors etc and that is what I'll now use them for instead.UPDATE:I was puzzled by why some of my pedals had interference while other did not and so I did some testing. The first thing I noticed was that the length of lead between the battery and the pedal had quite an effect. The longer the lead the quieter the pedal became. Next I hooked up a scope and noticed that at no load the internal regulator was still generating about 50mV of ripple at roughly 70Hz. (This thing is always awake!). The frequency of the ripple increased with load until it became roughly 200KHz under a 30mA load. So this explained why a longer lead which has more inductance and hence more filtering reduced the effect of the ripple. So I increased the supply rail decoupling and inserted an RF choke between the battery and the circuitry inside the problem pedals and "hey presto" no more noise!So the noise issue is dependent upon the amount of supply rail filtering within each individual pedal. Some designs are just more susceptible that others. Having added an RF choke to some pedals the batteries are now quite useable.I like the terminal voltage being >9v, the capacity being about 700mA/h and the nifty simple recharge feature. Also a minor mod to the pedals means I can use them for what I originally purchased them for so for me I've raised the rating to 4 stars. (However I won't be using these in any AM radios!)