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6v 4.5ah Sealed Lead Acid Rechargeable Battery: Amazon.co.uk
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ExpertPower 6 Volt 4.5 Amp Rechargeable Battery EXP645 | eBay
6V 6 VOLT SLA VRLA RECHARGEABLE 4, 4.5,5 AH battery by PowerStar - Walmart.com
UPG 4V 4.5Ah Universal Power Group 85923 Sealed Lead Acid Battery 806593405594 | eBay
Amazon.com: KEYKO Genuine KT-645 6V 4.5Ah Battery - 2 Pack Fresh & REAL 4.5 AMP AGM/SLA Sealed Lead Acid Rechargeable Replacement - F1 Terminal : Health & Household