bluovalguy
100 mW
- Joined
- Dec 8, 2013
- Messages
- 40
Home Depot recently had a sale buy 1 Ryobi P108 battery ($99) get one free. I already use these tools and have a bunch of chargers, so picked it up hoping they would work on my bike too. Here's what I found.
- TR 10 torx bit required, need to pry a plastic cover off one of the screws, but otherwise easy to take apart.
- 5s2p. Samsung INR18650-20Q cells. (2ah, 15a continuous rating.)
- 20.65v off the charger, 18v nominal. BMS only outputs about 8v until it's hooked to a tool, then the voltage will read properly for awhile till it resets... would be curious to find out how/why it works like this?
- *Added*- 2.1v sag with 18a load when battery is at 50% dod, for 1 battery in use as booster pack.
After finding the pack could handle some decent current, I paralleled these two and ran that in series with a Greenworks battery as a booster pack for about 62v fully charged. (Info on the Greenworks- http://endless-sphere.com/forums/viewtopic.php?f=14&t=55790) I soldered on to the contacts of a P115 battery gauge ($10) and did the same on an old P111 slow charger. The bike runs great at the higher voltage, and the controller is currently at 18a. One problem, it only pulled current out of one battery for some reason. Voltage was off about .1v when I connected them, so maybe the BMS just shut one down? I'm going to try again after recharging and see if that does it. After finding this, I tried both batteries individually at each connector and it ran the bike fine so it's not a wiring issue. I'll report back what ends up happening with this.
View attachment 1
- TR 10 torx bit required, need to pry a plastic cover off one of the screws, but otherwise easy to take apart.
- 5s2p. Samsung INR18650-20Q cells. (2ah, 15a continuous rating.)
- 20.65v off the charger, 18v nominal. BMS only outputs about 8v until it's hooked to a tool, then the voltage will read properly for awhile till it resets... would be curious to find out how/why it works like this?
- *Added*- 2.1v sag with 18a load when battery is at 50% dod, for 1 battery in use as booster pack.
After finding the pack could handle some decent current, I paralleled these two and ran that in series with a Greenworks battery as a booster pack for about 62v fully charged. (Info on the Greenworks- http://endless-sphere.com/forums/viewtopic.php?f=14&t=55790) I soldered on to the contacts of a P115 battery gauge ($10) and did the same on an old P111 slow charger. The bike runs great at the higher voltage, and the controller is currently at 18a. One problem, it only pulled current out of one battery for some reason. Voltage was off about .1v when I connected them, so maybe the BMS just shut one down? I'm going to try again after recharging and see if that does it. After finding this, I tried both batteries individually at each connector and it ran the bike fine so it's not a wiring issue. I'll report back what ends up happening with this.
View attachment 1