Battery Power Bank

thingiverse

I needed a battery pack that could charge or power an iPad, USB device, laptop, and/or any other device for an extended period of time; I also wanted the versatility of a 12v cigarette adapter. The box had to be compact, lightweight, and hold a large number of watt hours. The battery also had to deliver a substantial amount of amps and have a good C rating. The device can be charged from the cigarette adapter and it can run a 19v laptop or a 24v device with DC to DC converters. The printing and wiring of the device are straightforward. High-capacity lithium batteries like this one cost around $150, but SLA batteries are available for about $20. It's essential to exercise caution when connecting the wiring; use the correct charger, have the right crimp tool, avoid shorting the battery or confusing polarities. I used a screw and bolt as a terminal block for positive and negative connections, with the screw connected to spade connectors. Spade connectors are included with the 12v car adapter, voltage meter, and USB converter. I used Silicone insulated 12 gauge wire (since I had some spare); however, the components are only rated for 5 amps; thus, a much lighter gauge of wire could have been used. I use this battery for other purposes and want to support the maximum amperage possible for that battery. Please refer to the chart discussing amps, distance, and voltage. It's crucial not to short the battery, especially with lithium-ion batteries. K2 lists Caution warnings on the battery that you must adhere to and be aware of. Battery - Expensive K2 12.8V LiFePO4 Battery Pack 9.6Ahr K2 Energy K2C12V4A 12V 4Ah LiFePO4 Charger with Faston 250 Connectors Replace Faston with BATTERY TENDER CIG CIGARETTE ADAPTOR and check the amperage. Battery Cheap 12V 7.2AH Sealed Lead Acid Battery for Verizon FiOS PX12072-HG Re12V 1300mA Sealed Lead Acid Rechargeable Battery Charger For Car Motor Truck FCH Velcro, Stick sided and regular. Added in Line Fuse for short protection http://www.ebay.com/itm/172295716987?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT -Replaced 15amp with 7.5amp auto fuse Switch Three Position Selector Rotary Switch Power Ignition LAY7-20X/3 US Laptop Converters DC/DC 12V To 19V 76W 4A Car Power Waterproof Supply Module Converter Regulator Waterproof 12V Car Cigarette Lighter Socket USB Charger Power Adapter Outlet SM Universal Dual USB Port Car Char V 2.1A and 5V @ 12V-24V input Cigarette Lighter Socket 12V Charger Adapter Crimp tool and spade connectors.