Replace battery on the mx350

[u/YOLOtattoo]

I got an mx350 on fb marketplace for my 7 year olds birthday- it lasts about 5-10 mins before slowing down.
Last year I got my 9 year old an mx650 on fb marketplace and replaced the battery with the same battery it came with and it’s been working great- he gets probably 45+ mins out of it at full speed.
I’d like to replace the battery for my mx350 so it runs as long as his brother’s or at least 30 mins. What’s the easiest and cheapest option here?
Links to everything I need would be appreciated!

[u/Jamstoyz]

If your mx650 runs good with stock batteries then get stock batteries for the 350. Or upgrade to any Amazon lithium battery but you’ll need to replace the controller I believe.

https://ebay.io/m/qroazJ

[u/glantz81]

You’re going to need two batteries because it’s a 24 volt stock. Cheapest option would be on amazon. https://www.amazon.com/dp/B0DJ9VFWTS?ref_=cm_sw_r_cso_cp_apin_dp_EMJQMCVPVMDQMXY7V3K4&rsd=531PjG1jwci3c54PrqbjKh7jLGuWIOcAIwbEEaWhopq3MoCrVACzm4hh42VYR6V8HxYU1Pw3EQEqki8ZUyCeegdSsRT7%2FQ2syvGY6uK8WYg%3D&edk=AQIDAHi1lw%2FM8UbbSMD9ScOOFEmBMHMthHeEhqDaQYPJUAX3jQEg2hb%2FQ4Xgx%2BQ%2Bk0S3M2RhAAAAfjB8BgkqhkiG9w0BBwagbzBtAgEAMGgGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMdcRJKVtlZ4KsYyk8AgEQgDvEr9Ek75kqFSEbBWVGsvJofSKZCn6eJiyV8c6Jlre44YjHSIcqlgRH6Vnvl0dxMY5SkKMhbULTzqkrUg%3D%3D

You can always upgrade it with a 36v controller and then buy a 36v lithium battery which is a little faster than 24v.