Obviously, we can only guarantee the part we replace. For example, if we replace a battery at the customer's request, and the speaker, for example, becomes damaged in a few months, we can replace it for an additional fee because we can only guarantee the battery. The two components have nothing to do with each other. In situations where, for example, we replace the battery (say HUF 10,000) because it runs out of power quickly and it turns out that the problem still persists, we test the device and then find that Charge Controller IC error (Assuming a HUF 25,000 charge), the device will be charged a replacement battery charge from the Charge Controller IC replacement price. So 25,000-10,000 = HUF 15,000 to pay. In this case, the battery replacement was free for you.