Badlu was born in the village of Dhakla, in the district of Rohtak (now Jhajjar), Haryana, in 1876. He was an Officer in the Indian Army, and before the outbreak of the War he served with the 14th Murray's Jat Lancers Regiment, a cavalry regiment of the British Indian Army. During the war, Badlu joined the 29th Deccan Horse Lancers, and was sent to France in 1914. In March 1918, Badlu and his regiment were posted to the Middle East, where Allied troops were fighting the forces of the Ottoman Empire.

In September 1918, British Empire forces in Palestine renewed their offensive against the Ottomans. On 23 September Badlu’s squadron were advancing on enemy positions near the River Jordan when they came under heavy enemy fire. Badlu led a charge which captured the enemy position but was fatally wounded in the attempt.

For his actions, Badlu was posthumously awarded a Victoria Cross.

His citation in the London Gazette in 1918 describes his actions:
“For most conspicuous bravery and self-sacrifice on the morning of the 23rd September 1918, when his squadron charged a strong enemy position on the west bank of the River Jordan, between the river and Kh.es Samariveh Village.

On nearing the position Ressaidar Badlu Singh realised that the squadron was suffering casualties from a small hill on the left front occupied by machine guns and 200 enemy infantry. Without the slightest hesitation he collected six other ranks and with the greatest dash and an entire disregard of danger charged and captured the position, thereby saving very heavy casualties to the squadron. He was mortally wounded on the very top of the hill when capturing one of the machine guns single-handed, but all the machine guns and infantry had surrendered to him before he died. His valor and initiative were of the highest order.” — London Gazette, 27 November 1918

Badlu Singh was one of 11 Indian and Gurkha servicemen, who were awarded the Victoria Cross - Britain’s highest award for bravery during the First World War. Nearly 1.4 million men served with the Indian Army during the First World War of whom nearly 74,000 died and are commemorated by CWGC. Badlu is commemorated by the CWGC on the Helopolis (Port Tewfik) Memorial.