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Background. Childhood lead exposure from recycling used lead-acid batteries (ULAB) in unregulated areas is a significant cause of lead toxicity, particularly in low and middle-income countries. This study aimed to assess the proportion of children with increased blood lead levels (BLLs) in an informal settlement where ULAB recycling occurs. Methodology. This was a descriptive study conducted in Nairobi county, Kenya. Children aged 6 months to 7 years were recruited after obtaining written informed consent, completion of a questionnaire and collection of samples for complete blood count, ferritin, and lead analysis. Results. Out of 215 children, 17 (8.0%) had BLLs ≥ 5 μg/dL. There was a weak negative correlation between BLLs and ferritin ( r s (211) = −0.147, P  = .032). Conclusion. Our study confirms the presence of increased BLLs in children residing in the study area. Relevant authorities should legislate on safe ULAB disposal to protect the population from toxic effects.