Endless Sphere’s Tong Sheng thread convinced me to get the 52 volt TSBZ2B and Wee Wee battery from Biktrix in Sasjatoon, Saskatchewan, Canada. Cost was $499 and $299 USD plus about $60 for shipping. Biktrix has two web sites: www.biktrix.ca
. It seems both products are no longer on their Canadian site. The 52 volt version is rated at 700 watts.
Wee Wee Battery
Biktrix says this battery uses Sanyo GA 18650 cells. They put out 3.5 amps, so with 14 of them in series, and 2 such series in parallel (14S2P) configuration, you get a 52 volt, 7 amp battery = 364 watts in a very small (13cm x 7.5cm x 8cm) package!
The battery’s output is through Anderson connectors. They have heat shrink, plus some black electrical tape further on. The end of the electrical tape was already coming off when I received it. It would be better if something else was used.
After all, this is the only thing protecting the wires coming out of the bag - and rubbing against the bag’s zipper.
The battery’s top has a charge percentage meter.
Charging is through a 5.5mm/2.1mm power plug. The plug’s rear has heatshrink to protect it from shorting out. The charging outlet is just stuffed loose into the red and black seat bag.
The seat battery bag arrived a little banged up. The LEDs are supposed to all light up, but mine had a couple at the corners broken off. I removed the LED driver circuit and its battery.
The bag’s bracket clamps under the seat rails. The bracket is plastic, so I wondered ifit could handle the weight (3 lbs 12 oz). There is a quick release to remove the bag.
By sheer luck, on my bike the bag also just rests on the rear rack. That took a lot of weight off the bracket. However, when I later transferred the battery and motor to my current bike, I noticed that the bracket had started to crack. So did it crack because resting on the rear rack meant every road bump was transfererd to the bag? Or is hanging the bag and relying on the bag’s bracket as “suspension”, better? I don’t know.