High quality Boost converter for 24v applications, by CUI, inc.
This option is more expensive than those on amazon, but it has extensive engineering data offered with it. For professional applications with critical results, this is a good option.
(note the renderings are to be updated to show appropriate voltage). This adapter has many variants for different input-output voltage ranges. We encourage you to explore the same brand and model family for delivering other buck/boost needs.
If your design requires above 50 watts at the boosted voltage, this family of adapters is not recommended – and, other options become quite expensive or quite inefficient in power performance. So, you might consider other battery options rather than shopping for converters at higher power levels.