3.4 inches

[Upgraded 20A Suitable for LiFePO4 Lead-acid Battery Charger] 12V 20 Amp, 24V 10Amp 7-stage quick battery charger, Designed to charge, maintain and repair all 12-volt and 24-volt lead-acid automotive, LiFePO4, marine and deep-cycle batteries including AGM, GEL, EFB, SLA,Flooded(WET), Calcium in cars, truck, SUVs, ATV, motorcycle, snowmobile, lawn mower, boat, tractor, forklift, golf cart, etc. which is much faster than 10A or 6A automatic chargers. NEW REPLACEMENT AVAILABLE FOR ANY QUALITY ISSUE.
[High-efficiency Pulse Repair/Trickle Charge] Built-in advanced battery REPAIR mode to help recover old/idle batteries and extend battery life. If the battery cannot be charged, please use repair mode. The high-frequency and low-frequency pulse technology has good repair and activation effects, Automatically enters trickle/float charging mode after fully charged, keep maintaining your batteries during this winter and more, leave batteries for holiday months and still brand new when you back. pls Note: It can not repair a totally dead battery.
[Brighter Screen Visualized Charging & Winter Mode] Extra large LCD screen not only clear to see under the sunlight but also displays the charging and battery status; charge voltage and current, inside temperature, charge percentage, summer mode, winter mode, etc. Winter Mode, +0.2v on the basis of the original charging voltage, better boosts your battery activity and charges more thoroughly in low-temperature situations.