joepah
10 W
- Joined
- Aug 28, 2011
- Messages
- 93
2009 A2B Metro with about 500 charge cycles on the primary battery and 400 cycles on the secondary battery, and around 5000 miles total. The secondary is nominally 36v 11.4 ah.
Any suggestions for replacing the secondary battery with another brand and maybe 48v 15 ah unit?
Would a 48v battery overheat the existing controller, which is built in to the hub motor and is not serviceable (not for me anyways)
I don't have a means to measure battery capacity directly, but the range on the bike is down to 65% of the original capacity... Used to get 20 miles per battery at 2o miles per hour with a lot of fake peddling, for a total of 40 miles. Got me to Key Biscayne tennis center and a very scenic ride along Hobie Beach (near Miami).
I tried 24 hour charges, recharging after a few miles etc but it doesn't seem to change the gradual decline in battery capacity. At 90 lbs for the bike, I dont want to peddle too much.
A new secondary battery (Lithium Maganese, Made in Taiwan by HiTech) is around $700.
For $700 could buy a LiFePo4 48v 15 ah from GoldenMotor.com. Or buy a 36v 10 ah from Ping for $450.
Not going to recite all the relay, battery, motor/controller, swing arm and outright bike replacements during the first 2 years, as those problems don't seem to be relevant (knock on wood!). Let's just say my decision to buy an electric bike with a full 2 year warranty was worth it. I think the new model and backfits resolved most of those early failures.
Any suggestions for replacing the secondary battery with another brand and maybe 48v 15 ah unit?
Would a 48v battery overheat the existing controller, which is built in to the hub motor and is not serviceable (not for me anyways)
I don't have a means to measure battery capacity directly, but the range on the bike is down to 65% of the original capacity... Used to get 20 miles per battery at 2o miles per hour with a lot of fake peddling, for a total of 40 miles. Got me to Key Biscayne tennis center and a very scenic ride along Hobie Beach (near Miami).
I tried 24 hour charges, recharging after a few miles etc but it doesn't seem to change the gradual decline in battery capacity. At 90 lbs for the bike, I dont want to peddle too much.
A new secondary battery (Lithium Maganese, Made in Taiwan by HiTech) is around $700.
For $700 could buy a LiFePo4 48v 15 ah from GoldenMotor.com. Or buy a 36v 10 ah from Ping for $450.
Not going to recite all the relay, battery, motor/controller, swing arm and outright bike replacements during the first 2 years, as those problems don't seem to be relevant (knock on wood!). Let's just say my decision to buy an electric bike with a full 2 year warranty was worth it. I think the new model and backfits resolved most of those early failures.
