Subheading 8507.60 · Section XVI
8507.60 Electric accumulators; lithium-ion, including separators, whether or not rectangular (including square)
85 Electrical machinery and equipment and parts thereof; sound recorders and reproducers; television image and sound recorders and reproducers, parts and accessories of such articles
8507 Electric accumulators, including separators therefor; whether or not rectangular (including square)
8507.60 Lithium-ion, including separators, whether or not rectangular (including square)
Other subheadings under 8507
8507.10 Lead-acid, of a kind used for starting piston engines, including separators, whether or not rectangular (including square) 8507.20 Lead-acid, (other than for starting piston engines), including separators, whether or not rectangular (including square) 8507.30 Nickel-cadmium, including separators, whether or not rectangular (including square) 8507.50 Nickel-metal hydride, including separators, whether or not rectangular (including square) 8507.80 Other than lead-acid, nickel-cadmium, nickel-metal hydride and lithium-ion, including separators, whether or not rectangular (including square) 8507.90 Parts n.e.c. in heading no. 8507
For Indian shipping bills you need 8 digits. These six-digit codes are the international HS 2022. India's ITC(HS) classification (DGFT) and Customs Tariff (CBIC) add two more digits for the national tariff line, so pick the 8-digit line under your 6-digit code there, and confirm with your customs broker for anything borderline.