ECO-WORTHY 12V 30Ah LiFePO4 Lithium Battery, 4000+ Deep Cycle Rechargeable Battery with BMS for Ham Radio, Fish Finder, Replacement of 12V 35AH SLA

Is there harm to the battery charging and discharging at the same time? No... In fact, if you think about it, you likely do something similar daily with tablets, laptops, phones, etc. This is further proven via the numerous portable radio stops that are supplemented with solar charging, which charge the battery via a charge controller while the operator is using it. Does constant charging (while driving) lessens the life of the battery? With a proper charger, this wouldn't be the case. Once the battery is fully charged, it would then cease trying to charge it further... The battery's BMS also tends to protect it, as well. FYI, this is the charger I use... simple, but effective Also, what battery are you using? I've been using a 30Ah CYCLENBATT off Amazon, though it doesn't appeared to carried anymore... At least through their Amazon storefront. I also have an ECO-WORTHY 30Ah battery. Neither has given me any issues this far...

That battery won’t put out enough amps for what you’re hoping for. It maxes out at 20ampls but in the description says for motors from 100-350W which is only 14amps max. For my 12V build I went with one of these batteries that can continuously do 30amps, maybe you could do two in parallel? https://a.co/d/0ivJsBey But I don’t think 30amps at 25V will give you enough umph to get to 20mph. 20mph is really fast! One of the reasons the drill batteries are so popular is that they can put out a lot of current, the downside is that they have small capacities so they run out quickly. Although they are easy to swap if you have a few of them!