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So, the 6s compatible Castle Creations Mamba Monster ESC in my newly-acquired, used E-maxx Brushless fried itself on its first outing. I'm thinking possibly a ripple current caused by using a pair of 2s 4200mAh LiPos that couldn't handle the current draw has caused the capacitors to fail. I must admit I didn't realise this was a possibility until after I'd blown the speedo and searched online for a possible cause. So, I now need to replace the speedo and get hold of some better batteries before I end up with yet another useless RC truck I've found a used example of the same speedo for £90. I was quite happy with the performance of the Mamba Monster on 4s but that seems like a lot of wedge for a used speedo, especially as it'll have no warranty if I fry it again. (It looks like some Mamba Monster speedos had a habit of frying themselves and were replaced under warranty). The current model (Mamba Monster Max) retails for £175. That's a lot of cash for someone who isn't supposed to be spending money on toys. I've got a baby due in just over a month! It's especially a lot of cash if I also need to fund two new 2s packs. HobbyKing list a Turnigy 1:8 ESC: https://hobbyking.com/en_us/turnigy-160a-1-8th-scale-sensorless-esc-w-fan.html It'll only go to 4s, but then I was unlikely to run the Maxx on 6s anyway as I don't have any 3s packs. I already have a Turnigy programming box for my 1:10 TrackStar Turbo ESCs but I don't know if it will work on the 1:8 ESC. At less than £50, it seems like a bargain. I love the TrackStar series and use them in my HotShot and my CS drift car. HobbyKing also list their own 1:8 ESC: https://hobbyking.com/en_us/hobbykingr-tm-x-car-beast-series-esc-1-8-scale-150a.html £60 and it'll run up to 6s. I'm not sure if either of these will give the same performance as the Mamba Monster; part of me is reluctant to spend any money if I'm going to end up with a less good truck. And so onto batteries - I'll want hardcase LiPos of at least 5000mAh with at least 30C rating. I've used Turnigy NanoTech batteries for a while without any issues but it was a pair of 4200mAh NanoTech stick packs that were in the truck when the speedo smoked itself. I guess it's worth spending on good quality packs if it'll protect my investment in a good quality speedo. Any advice gratefully received