Originally posted by keilau
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The Lithium Polymer battery pack is another economical choice. The LiPo is popular with the flying machine crowd and very cheap. An under $15 2200 mAh pack with XT-60 plug can be easily found at Amazon. It is about 4.25" long and fits the HL battery hole comfortably. It gets slightly more than 1.5 hours run time. There is a jump in capacity and size to 5200 mAh and 5.6 inches in length. The 5200 pack is almost the same price as the 2200 pack. I got a pair of GoldBat 5200 for $30, but cannot fit them onto the HL. The 5.6" is shorter than the HL battery hole, but the power cable on the end making it impossible to fit in without cutting the tank chassis.
(As a matter of principle, I do not modify tank chassis between the sprocket and idler wheel.)
The best performer is Lithium Ion based pack, but they are getting very expensive and hard to get due to the EV industry. Typically, the pack has 2 18650 or 4 18650 cells which should have 3000 or 6000 mAh capacity respectively. But only if they use premium Li-Ion cells, usually made in Japan or Taiwan. Mato and Admirals are the premium Li-Ion pack brands. The premium 18650 cell is very easy to identify which weights in at 47 grams or more. Cheap, low performance 18650 cell weights about 37-41 grams and holds only about 1000 mAh or less. The Mato and Admirals pack sell for $30 and $60 respectively for the 3000 and 6000 mAh pack. If you ticker with electronics like me, you can build DIY Li-Ion pack at a lot lower cost. I also built 2x 26650 cells pack. They charge up to 4700 mAh and is perfect in size for the HL battery compartment. It gives about 2.5 hours run time. I have not seen any commercial pack using the 26650 yet.
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