步骤四：更换原型号电池。

Step four: replace the prototype cell.

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手表换电池应该按规定换原型号，也不能试图用充电或火烤的方式去恢复旧电池的电力。

Watch for the battery should be replaced by the provisions of the original model, but also can not try to use a charge or fire baked way to restore the power of the old battery.

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P2勉强称得上是测试原型并取得了成功，但是并没有成为更为人知的R系列家族的真正初始型号。

The P2 was a test prototype of sorts, and proved successful, but it never became the true series-starter for the more familiar R-series line.

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