Is the battery completely dead? During this lockdown not sure if you will get a battery at a nice price. If you want you can try to add some acid (you can buy it at you local spares or battery shop) to the battery is best bet. Distilled water can work but you need to place it on a long charge. Some of these sealed batteries loose alot of fluid and obviously if you loose 1/3 of fluid the battery only holds 2/3 capacity and so on.
But first pull off the stickers then open the sells and check(used circlip pliers to turn and open them) if they are clear and look clean you can add acid or distilled water and charge the battery. I have saved x2 batterys in this way and I must add they were able to turn the engine just just when standing for 3 or 4 days and after acid and charge no more plroblem.