Yes, you can replace a 700mAh rechargeable battery with a 2800mAh 1.2V battery in devices like a Walkman or electronic trimmers, as long as the physical size and connector type are compatible. The higher capacity (2800mAh) will provide longer usage time before needing a recharge. However, ensure that the device's circuitry can handle the increased capacity without any issues. Always check the manufacturer's specifications to avoid potential damage.
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