Battery suggestion

Best battery for a stock bike would be AGS in my point of view. I have installed dual Bosch horns in my CG and AGS battery recently so far no issues Allah ka shukar.

Open side cover and take the battery out. Clean battery with a dry cloth and check acid level. If acid level is between min and max mark it's fine. If it's lower than min mark get acid bottle of AGS for bike's battery which costs 20 rupees only. Fill it up to max mark. Then ride your bike in daytime for 15 kilometers at least. Check if horn sound gets better. If it doesn't visit a good electrician and tell him to check if charger is working fine or not. BTW it's been 2.5 years pretty sure battery has done it's job. 450 ki battery hai what more do you want? If you buy a brand new battery make sure you get AGS. Retailers gonna say get this and that one you will get 10-12 months warranty instead of 6 but don't. These are marketing tools because battery companies and retailers make higher profit on batteries which don't sell frequently. 10 months ki warranty ka koi faida nai because majority of batteries die after 2-3 years. If battery is having a manufacturing defect it's a 99% chance it will fail within few weeks of usage.

Using HID on stock battery is always a fail. Tried and failed countless times.

Go for LED light. known as 2D in the market terms. The Result is satisfactory not as good as HID but it works and do the job. Can be run on stock battery but my recommendation is to use 4.5 Amp battery for better performance