Super Electronic Dynamo

The Super Electronic Dynamo (超電子ダイナモ) is a device that was created by Black Satan scientist Yoichiro Masaki, who implanted it into the body of Shigeru Jo as part of an operation to upgrade Kamen Rider Stronger. This gave the Rider ability to "Charge Up!". Parts of him would turn silver and the S on his chest would spin. This form is said to be 100 times more powerful than his normal form, but after using his finisher moves, Stronger would temporarily become vulnerable, a weakness that was exploited by his enemies.

There was a price to pay for this increased power however, Stronger had 1 minute to disperse the extra energy, by using it against his enemy or he would explode.

By the time of the battle against Neo-Shocker, Stronger was able to perform the more powerful finishing moves granted by Charge Up without changing form.