MIGHTY MAX BATTERY 12-Volt 21 Ah 350 CCA Rechargeable Sealed Lead Acid (SLA) Powersport Battery YTX24HL-BS - The Home Depot
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Deep Cycle Lithium ion 12V 21AH Gel Battery
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Amazon.com: Chrome Battery 12V 21AH SLA Rechargeable Replacement Battery for UPS Back Up and More: 7.15 x 6.59 x 3.03, Nut and Bolt Terminal : Automotive