You just need to understand what spec battery the Gizmo requires and you can get it at 5-9 bucks elsewhere. It can use a fairly common electric shaver battery. So the Gizmo can go on and on!
Gizmo uses a battery pack consisting of two rechargeable AA batteries that have tab ends, not bump ends. You must get a Ni-Cd battery. The Gizmo charger is not forward compatible with Ni-Mh or any other technology. In addition, the two batteries must be connected in series, meaning the + of one is connected to the - of the other. There is a shaver battery pack that comes this way already made. The other two free ends have metal tabs that go into connectors that are on the ends of the hot and neutral wires inside the Gizmo egg. Wiring in series doubles the voltage to a sum of each battery's voltage, so this pack consists of two 1.2v batteries in series for a total of 2.4v DC that the Gizmo requires.
The original battery has 600Mah. You can get a battery pack with 600 or higher MaH. Higher is just more storage capacity, which is fine and compatable. I got 800Mah. Mah doesn't double like voltage in series, so whatever the MaH is for one battery is also the MaH for the pack.
The original battery pack, like this, has each of the tab ends on opposite sides. The much cheaper shaver batteries have the two tab ends next to each other, so it's a little harder to get the one wire to be able to reach the one tab. I ended up putting the shaver batteries in sideways- perpendicular to their intended position, and got everything connected, and the egg could still close.
Note the egg opens easily by simply removing the two screws, each going through a side.
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