Originally Posted by
Iride01
What did you use to charge the battery? You need to use an adapter that will put out more than 1 amp. They say 1 amp or better, but I've been bitten when using an adapter with 1 amp.
Unless you have USB 3 on your computer and know which USB port is the USB 3 port, then it only puts out .5 amps. So it's a poor choice
I used Shimano's own charger (SM-BCR2) which was plugged into the USB outlet of a power strip.