Tomy Omnibot 5402 6V Battery how to source a generic replacement and modify it to fit
Some information that may help you find an appropriate 6V Battery for your Tomy Omnibot 5402. The Factory battery is labeled NP4-6W searching for that online will likely lead you to the correct battery with F1 blade terminals. A 5.5mm x 2.1mm male barrel connector with 16-14 Gauge wiring pigtail crimped with 16-14 Gauge Female Blade Connector and heat shrink tubing. Avoid charging past 6.4 volts. Avoid leaving the battery in your Robot and do not use a charger that puts out for than 6.9 volts or corrosive gas may escape.
