This 71.4V 4A Lithium-ion battery charger is designed for fast charging of high-capacity batteries and can charge any Lithium-ion battery at 4 amps. It is not recommended to charge lead-acid batteries or SLA, AGM batteries, it is too powerful. This charger has a built-in high-strength aluminum casing and cooling fan for fast cooling, and is rated at 4A, which can charge a 10Ah Lithium-ion battery in 2.5 hours, or a 20Ah battery in less than 5 hours in less than 12 Charges a 50Ah battery in hours. For smaller batteries (<10Ah), we recommend using a 3A charger. All Lithium-ion batteries should be charged with a Lithium-ion battery compatible charger, like this one. Charging a lead-acid battery with a SLA AGM charger will degrade the performance and life of the battery. Charger output 71.4V 4A ±0.2 There is an adjustable resistor inside the charger, which can adjust the voltage and current within a certain range, and the aluminum shell charger supports customized output plugs 1. Are you a factory or a trader? We are a charger manufacturer with R&D and production teams 2. Does it support customization? We support free customization of 100PCS charger labels, LOGO. 300PCS color or function customization 3. Is there any warranty? Our warranty is 1 year (man-made damage, natural disasters, war and other force majeure reasons are not guaranteed) 4. When will you ship the goods and when will you receive the package? We usually send the package within 2-15 days, the air delivery time is generally 7-15 days, and the sea delivery time is generally 25-45 days

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