I modified an m3 engine by removing the two 1/3 AAA Ni-Mh in series with a new (to me) 10280 rechargeable lithium ion battery.
I also modified the m3 engine charger to charge the lithium ion battery bypassing the circuit board. ![[-]](https://www.blueplastictracks.org/images/collapse.png)
The following 4 users Like mitzalplik's post:• Destination Realization, MrKirby48, Ron Thunderr, Super 
Nice work Mitza. May I ask the question, What does this change make?
More variable power selection (3.6v vs 2.4v) more consistent power (uphills, multiple trucks, taking corners) as Li-Ion has more current output than ni-mh. Better capacity storage hold from Ni-Mh. And better capacity consistency when charging (no more memory problems).
Sounds good Mitza although all over my head LOL 😁
That can't be true you guys are monsters here lol, I think you're being humble... Good o' Super 🥴.
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