14.8/3.7=4 The voltage of your single battery is 3.7 V. If you want to connect it to 1408 V, you need to connect four cells in series. The method involves connecting the positive terminal of the first battery. the negative terminal of the second battery. The positive pole of the second is connected to the negative pole of the third, and the positive pole of the third is connected to the negative pole of the fourth, so that the negative pole of the first and the positive pole of the fourth are 14.8V.
If you have more batteries, there are sixteen batteries in total, so you can first connect four of them in parallel, or four in parallel, and finally connect those in parallel in series, which will be also 14.8 V., but the capacity will be multiplied by four.
The parallel connection method is to connect the positive pole of the battery to the positive pole and the negative pole to the negative pole. As shown below