I found this post on another ebike forum web site. I am wondering if anybody can confirm this? Does it work?

I presently run a Bionx PL-350 on a Catrike 700 Recumbent. I added another 36 V. 20 A/h battery pack (LiFePo4) in parallel with the the original 36 V. Li-Mn battery, thus tripling the original Bionx range. I opened the Bionx battery case and soldered black and red 12 AWG wires to the two heavy blk. and red. wires coming out of its battery pack. Led the wires out of a hole drilled in the side of the case via a spst toggle switch and 0-10 Amp DC ampmeter (both shoe-glued at a 45 degree angle to the top rear of the case,) and a 30 amp fuse, to the LiFePo4 battery pack sitting in a Sears canvas tool case strapped to a rear luggage rack. The switch was necessary to simultaneously, yet separately, charge the 2 battery packs with the two different chargers.
Since the Li-Mn battery pack has a lower internal resistance than the LiFePo4 battery pack it discharges slightly before the latter. I live in the Mohawk River Valley in Utica, N.Y.where are roads are mostly rolling hills. With the present set-up I get, at assist levels 3-4, approximately 80 miles range and 4-4.5 hours of riding time at an average speed of 20 mph. Using assist level 1, w/o using regen. mode except for braking at stop signs, I could theoretically ride 120 miles at 15 mph for 8 hours.


I am trying to figure out how to build my first electric recumbent. I am thinking (if this does work) on using the Bionx 250 with an additional Ping 30 am battery. That would keep me ebiking all day long.

Any feedback would be appriciated.

Thanks