I use this particular battery for my Dunlop Crybaby Wah Pedal, which eats up relatively large amounts of energy when used actively, and keeps eating away discreetly even when it is not being used actively but left hooked up (hence left on) during breaks etc. Yet this battery keeps holding its own through a couple of rehearsals and a gig with the Wah used at least half the time.
Thanks to the strength of the battery, the Wah pedal does not cease to operate suddenly either as it might do with inexpensive disposable batteries but rather gives a discreet sign in the way that the signal power gets slightly less stronger and the Wah effect a little less apparent, so that it is time to pull the wahwah pedal out of the chain or replace the battery.
I use the inexpensive Texus unit which comes with one battery of its own, to charge the Ansmann on the second slot of the Texus, and it does just fine to get charged overnight and back in the wahwah the next day at full force.