Hey there,
finding out if your Switch is patched can be done in multiple ways.
Either, you check your serial number. Here you can check, if the serial number of your Switch indicates if it is patched or not. The Serial number is on the white Sticker on the same face of the Switch as the USB C port.
Otherwise, just try going into RCM and start hekate with a tool like TegraRcmGUI. If your Switch is patched it will simply do nothing. If the battery or the BQ24193 are broken, usually RCM and hekate will start, only horizon (the original OS) usually refuses to start, due to the checks @KiloooNL mentioned.
Hope that helps.
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