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If you don't buy a local SIM card (e.g., TelkomSel Simpati) to use a phone in Batam, but you prefer to keep using your usual phone with your usual SIM (e.g., to keep using your WeChat and WhatsApp IDs), then you are bound to using WiFi to access Internet. In most hotels, the wifi is good, but the wifi provided by restaurants and cafes mostly sucks.

If you give up using the wifi of JCO and restaurants in Nagoya Hill because they are slow and run out of IP addresses to assign, as I gave up, there is a good alternative: the @wifi.id network, available almost anywhere in Nagoya, Jodoh and I assume around Batam cities.
One week access is only 20k payable by SMS from a Simpati SIM card (I have TWO phones: my Galaxy smartphone and an old Nokia with Simpati SIM card). Once you pay, you receive an SMS with ID and password.
The speed of @wifi.id is acceptable in Nagoya (adequate for web browsing and chatting), but very slow in other places, for example Ramayana mall Jodoh. Now, I am using it always, instead of asking the pw from restaurants or cafes. It is available also in Harbour Bay and Windsor. That's very useful, because you can be online also using your regular phone almost anywhere without expensive data roaming.