Replacement battery fits 5 MTC compatible models. Specifications: 3000mAh, 8.4V, Ni-MH. Compatible with: Water Tech Pool Blaster Max, Water Tech Swimming Pool, Pool Blaster Swimming Pool, Pool Blaster Max, 3937 MEGATECH. Replaces: Pool Blaster 10142A007, Pool Blaster PBA007, Pool Blaster 7C2219MF, Pool Blaster PB-BH843-RR1P. MTC replacement battery designed for Vacuum devices.