Woot offers NOCO Boost XL GB50 1500 Amp 12-Volt UltraSafe Portable Lithium Car Battery Jump Starter Pack OR NOCO Genius G3500 6V/12V 3.5 Amp Battery Charger and Maintainer for $34.99 (reg $79.99). Free shipping for Prime Members.


Product Description:
NOCO GB50 1,500 Amp UltraSafe Lithium Jump Starter
The NOCO GB50 is an ultra-portable, lightweight, and compact portable lithium car battery jump starter pack for 12-volt batteries. With it, you can safely jump start a dead battery in seconds - up to 30 times on a single charge. It's a mistake-proof portable car battery jump starter battery booster pack, making it safe for anyone to use and features spark-proof technology, as well as reverse polarity protection.
The GB50 portable car battery jump starter integrates with a high-output 200 lumen LED flashlight with 7 light modes including low, medium, high, flashing, strobe, and emergency SOS. It can hold its charge for up to one year without being recharged. Its internal battery can be used to recharge any personal mobile devices like smartphones, tablets, or any other USB device, by any powered USB port. It's rated at 1500-amps, and suitable for use on gasoline engines up to 7 Liters and diesel engines up to 4.5 Liters, such as a car, boat, lawnmower, and more. 
START DEAD BATTERIES: Safely jump start a dead car battery in seconds with this compact, yet powerful, 1500-amp portable lithium car battery jump starter pack - up to 30 jump starts on a single charge - and rated for gasoline engines up to 7 liters and diesel engines up to 4.5 liters.
ULTRASAFE: Safe and easy to use car battery jump starter pack without the worry of incorrect connections or sparks. Safely connect to any 12-volt automotive car battery with our mistake-proof design featuring spark-proof technology and reverse polarity protection.
MULTI-FUNCTION: It's a car jump starter, portable power bank, and LED flashlight. Recharge smartphones, tablets, and other USB devices. It's easily rechargeable from any powered USB port in 5 hours at 2.1-amps. Plus, an integrated 200-lumen LED flashlight with seven light modes, including emergency strobe and SOS.
ADVANCED DESIGN: Our most advanced portable car battery jump starter ever.

• Featuring high-discharge lithium technology for safe operation in any climate (-20ºF to 140ºF).
• A rugged and water-resistant enclosure rated at IP65.
• A rubberized over-molded casing to prevent scratching or marring of surfaces.
• An ultra-compact and lightweight design, measuring 3. 4 x 1. 9 x 7. 7 inches and weighing just 2. 7 pounds.

GB50 Specifications Sheet
 
NOCO Genius G3500 6V/12V 3.5 Amp Battery Charger and Maintainer
The NOCO Genius G3500 Smart Battery Charger is designed to charge 6-volt and 12- volt lead-acid and lithium-ion batteries up to 120Ah. It can also effectively maintain automotive, marine, RV, power sport, lawn & garden and deep-cycle batteries. It charges 2x faster than ordinary battery chargers, can repair damaged batteries and is designed for use with micro-hybrid start-stop vehicles and CANBUS electrical systems. Guided by an onboard microcomputer, the G3500 monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable, and incredibly lightweight. 

• It can efficiently charge automotive, marine, RV, powersport, lawn & garden and deep cycle batteries.
• Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode.
• The G3500 monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection through an onboard microcomputer.
• G3500 charges batteries twice as fast when compared to ordinary chargers and is designed for use with CANBUS electrical systems and micro-hybrid start-stop vehicles.
• It also features external mounting holes and a rubberized base that avoids surface slipping and scratches, while remaining impact, UV and water-resistant (IP65).
• Designed for use on 120-volt 50-60Hz electrical systems, the G3500 includes both X-Connect battery clamps with integrated eyelet terminals.