Fourchannel battery tester with independent channels for simultaneous, interference testing Independent fourchannel capacity and internal resistance measurement lets you test multiple cells or packs at once with no cross talk Direct current twowire method provides accurate internal resistance readings, especially when the battery is fully charged Separate charging and discharging with automatic mode supporting up to 9 charge/discharge cycles for repeatable testing Fully automatic cutoff: charging ends when preset conditions are met and discharging stops automatically; cycle count adjustable from 1 to 9 Compact bench unit with sturdy construction for reliable lab or workshop use; compatible with standard rechargeable cells and packs Practical use scenarios Research and development: characterize Liion cells or packs during product development Quality control: screen production lots to ensure consistent resistance and performance Field service and maintenance: verify drone, RC, or portable device battery packs during routine servicing This device focuses on function, compatibility, and performance, offering precise measurements, flexible automation, and a clear path from test setup to actionable results.