OP, I have your number "2" from Lazada, but that is only 4amp, you need the 7 amp which costs around 300 bht.
It is very good at revitalising batteries, it has a de-sulphate thingy, gets stuff off the plates. It needs at least 7amps in the battery to work on a dead battery, but you can get over that by first connecting the dead battery to a good battery to transfer some volts. A multi-meter is useful.
I take the car battery off every 3 months or so and let the smartcharger do its thing. So far, does what it says on the tin....... Recommended...🤗