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Bookoo via Amazon [amazon.com] has Bookoo 12V 16000mAh Car Battery Jump Starter Box for $36.99 – $15.17 w/ promo code YR13VMN8​ = $21.82. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[LIST][*]【Powerful Battery s】 – With a 1600A peak current, the 59.2Wh car battery s can jump start most 12V vehicles up to 7.2L Gas/5.5L Diesel engines in seconds. even at -4ºF~149ºF, The powerful lithium motorcycle booster pack – up to 20 jump starts on a single charge (just over 25% of power is enough to start your car). Suitable for car, trucks, van, riding mower, motorcycle, boat, snowmobiling, ATV, RV, SUV, watercraft, yachts or tractor and so on.