I'm using the wireless bottle warmer from nicepapa, bought from shopee. It depends on heating panels in the warmer to heat up the milk, and takes about an hr to go from fridge cold milk to warm. I use it if I'm running on shorter trips out. Put warmed milk in the warmer to conserve the batt, and then when finished, put the next bottle in so tt there's time to slowly warm. This one takes pre-planning since the heating is slow. battery can last for 1 heat up from cold to warm, and 1 preserved warm bottle before needing to be charged. Good for my usage thus far. I spent about $40. I'm assuming you're asking about portable bottle warmers and not those tt u use at home haha.
currently using a brand called jiffi (bought from taobao) now. one good thing is that it has a version where the battery capacity is 9000mah, larger than most others in the market and I can use it entire day for at least 3 to 5 times without recharging. it also has the option of buying with uv sterilizer cap where you can use to sterilize the inner metal panel, instead of just wiping and using hot water to heat it for a few seconds. However not sure about other brands, but I tried heating up a 140ml milk bottle from around 10degrees to 40 degrees and it took more than 10 minutes.
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