I decided it might be a good idea to switch my wife's bike's battery pack over to something a little easier for her to take care of herself. We've been using lipo for several years without issue but I wanted something she could just plug in when she's done with the bike without having me do it (the real reason. lol).
I ended up buying a 36v 10ah "shark" pack (Panasonic cells) from a seller here in the states hoping to avoid quality issues from Chinese sellers. We got the battery in February and she has only gone on around 4 or so rides being gentle with it to break the cells in. Anyway, last night I noticed that the green light comes on the charger very quick. This is after an 8 mile ride. I would say it was plugged in less than 1/2 an hour. So I pull out the 'ol multimeter and the overall resting voltage is 39.7v. Hmmm. Shouldn't it be much closer to 42v on a fully charged pack? I'm going to assume it has a dead cell(s).
On a side note, when you plug the charger into the pack there's quite the spark. And before someone asks, I plug the charger into the battery first then into the wall. Is the spark in indicator of something wrong? None of my other packs do this.
I ended up buying a 36v 10ah "shark" pack (Panasonic cells) from a seller here in the states hoping to avoid quality issues from Chinese sellers. We got the battery in February and she has only gone on around 4 or so rides being gentle with it to break the cells in. Anyway, last night I noticed that the green light comes on the charger very quick. This is after an 8 mile ride. I would say it was plugged in less than 1/2 an hour. So I pull out the 'ol multimeter and the overall resting voltage is 39.7v. Hmmm. Shouldn't it be much closer to 42v on a fully charged pack? I'm going to assume it has a dead cell(s).
On a side note, when you plug the charger into the pack there's quite the spark. And before someone asks, I plug the charger into the battery first then into the wall. Is the spark in indicator of something wrong? None of my other packs do this.