About DC size : we will send you 5.5*2.1mm if without your notification.(5.5x2.5/3.5x1.35mm.. also available ) Product Description lithium battery charger 36v2A 1. Nominal voltage : 42V 2. Nominal current: 2A For 10 series lithium /Li-poly batterey Application:electric bicycle,E-bike,electrical equipment,ect. We also have several series for your reference: 12.6V14.6V16.8V29.4V33.6V37.8V 42V 54.6V etc. We can customize different voltage and current as customer's requirement Technical data Max. Output power:84W Input voltage: 100-240V AC Max. output voltage: 42V Max. output current: 2A Line frequency: 50-60Hz Efficiency(at 100% load): =85% Ripple: =1%*Vo Temperature range: 0-45'C Relative humidity: 65% Protection Over voltage protection Over current protection General specification 3-step charging control (pre-charge-CC-CV) Option: a) NTC inside b) 100% cut off when battery fully charged Dual color LED indicator: (Charging:Red; Fully charged or no load:Green) Light weight and compact High efficiency and low power consumption Environmental specification Operating temperature: 0C ~ 45C Storage temperature:-20C ~ 70C Humidity 65% Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them!