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I'm not trying to preach to anyone. Any one can read these threads, so all I'm suggesting is that that unless people really know what they are doing, (as I have no doubt you, and many people on this site, do) they excercise some caution when playing around with lithium cells. Ok you build your...

Interesting, though I would recommend caution when connecting two battery packs in Parallel. They really should be the same type (chemistry),condition (age), voltage and amp/hr rating to be sure that the combination does not become unbalanced, causing loss of performance and/or cell damage...

So I'm new to this site but is it normal to go so far off the forum topic so soon ? or am just being a bit of an old fart.

I'm 70 years old with a dodgy hip, so my Oxvgen MTS is my only way of getting up into the hills I love. I recently renewed the battery ( nice cheap Dorado battery from China) with a 17.5 amp/hr unit. Just as an experiment, I fitted another 250W motor to the front wheel. Simple second controller...