Lithium LiFePO4 batteries are the best replacement for lead-acid batteries, the charging voltage of ordinary 12V lead-acid batteries is 12V, while the charging voltage of 12.8V lithium-ion batteries is 14.6V, AGM battery charger cannot fill lithium-ion batteries and long time use will shorten the life of lithium-ion batteries, SefePoder charger have been specially designed for 12.8V Lithium batteries to make your child's electric wheel last longer!