Took about 5, 6 minutes of standing in the Electro anomaly with 4 Battery artifacts on. I think if I had 5, it might be a little quicker. You can also heal yourself and repair your suit by equipping 4 to 5 Pellicle artifacts and standing in the Fruit Punch anomaly or by equipping 4 to 5 Spring artifacts and standing in the Springboard, Whirligig and Vortex anomalies. The key is having your anomaly protection up past 100% and it only works with these 3 artifacts (Pellicle, Battery and Spring) as far as I know.
Thank you to the Stalker wiki for making me aware of this, as it dramatically increases the usability of expensive sets of armour, as well as making irreplaceable unique suits of armour a very viable choice.
![](https://i.ytimg.com/vi/5PodhQUM998/mqdefault.jpg)