Cited as a reference
EEVblog #751 - How To Debunk A Product (The Batteriser)
Why people recommend it
Cited as an EEVblog reference on how battery voltage relates to remaining energy and the cutoff voltage at which devices stop working.
Watch for: reference for battery cutoff behaviour
In their words
Edit: In case you want to learn more about this effect, watch EEVBlog Dave's video about the Batteriser where he debunks that product (on the grounds that there isn't much to gain from such a device) but while doing that he shows how the way you're discharging a battery determines how much charge you can extract.
Bimpelrekkie on electronics.stackexchange.com, Jan 2018. CC BY-SA.
Dave Jones about AA battery booster clip, if you're interested.
Asmyldof on electronics.stackexchange.com, Jun 2015. CC BY-SA.
A lot of devices will run until each battery drops to 1v (See EEVBlog [video]), and a 5v phone charger can produce an output voltage from 4.75v to 5.25v, which should be more than enough to operate the toy.
Trevor on electronics.stackexchange.com, Jun 2015. CC BY-SA.
