AFAM GROUP - NITRO batteries are the best possible choise as a replacement battery. Available in conventional, AGM batteries with Acid Pack to factory activated SLA batteries which are 100% maintenance free,
Shido DC4.0 4A Dual Battery Charger For 6V or 12V Lithium & Lead Acid Batteries | eBay
AGM maintenance free: NITRO YTX14H-BS AGM open with acid pack HP 14NTX14H-BS(dimensions L:150,W:87,H:145)
BATTERY 6V 6,3 Ah 6N6-3B-1 NITRO - WITH MAINTENANCE (Long 99mm x Wd 57mm x H. 111mm) - P2R