Batteries for dummies

canis2022

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It looks like my battery is in need of replacement. Has anyone had any luck having them rebuilt or is it best to just get a new one?
It currently has a Samsung 48V downtube battery. I attempted to take it for a ride this morning but, only got about 20ft before it shut down.
I did a test with a voltmeter ( I'm not that skilled with a meter) anyway, I got a reading of 53v with the meter set at V... (200) I tried a few more times using just peddle assist but after a couple hundred feet, the battery showed just 50% on the meter after being fully charged the day before. I'd say the battery is aprox. 5 years old (bought the bike used 3 years ago)
 

CloneWerks

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Sudden voltage sag like that generally means one (or more) bad cells in the battery. 5 years is a pretty good run for a battery that works as hard as an eBike does. What is the make/model of the bike?
 

canis2022

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Sudden voltage sag like that generally means one (or more) bad cells in the battery. 5 years is a pretty good run for a battery that works as hard as an eBike does. What is the make/model of the bike?
It's a BPM F55
 

CloneWerks

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Okay, I know nothing about that bike but the pack looks like a pretty standard setup (not one of the built into the frame or other types of insanity).

I have an ancient incandescent spotlight that runs on 48v which I only keep around to create a load for battery packs so I can test for bad cells. If you have a Batteries+ store or something like that I'd bet they can run load test(s) and see where you are at. They can probably even rebuild the pack. (hint, if you can get panasonic cells DO IT!)
 

canis2022

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Okay, I know nothing about that bike but the pack looks like a pretty standard setup (not one of the built into the frame or other types of insanity).

I have an ancient incandescent spotlight that runs on 48v which I only keep around to create a load for battery packs so I can test for bad cells. If you have a Batteries+ store or something like that I'd bet they can run load test(s) and see where you are at. They can probably even rebuild the pack. (hint, if you can get panasonic cells DO IT!)
I hadn't thought about batteries + but, that might be an option. I'll give them a call before I go any further. The other option might be FTHpower
out in California. Someone on this forum had mentioned them and from what I can tell, they seem to be a first rate outfit. However, if batteries+ can rebuild the battery, I'd save a lot of money in shipping costs since they have a store about 20 miles away. Thanks for the info. I'd rather keep the same battery because I'm skeptical about trying a different battery mfg. and hoping the specs. match up with my controller and display etc.
 

kesd

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Not sure if any help but i have 2 new (had literally about 5 charge cycles) bosch batteries for sale on Geartrade at the moment. I did put them on the sale section if interested.
 

canis2022

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Not sure if any help but i have 2 new (had literally about 5 charge cycles) bosch batteries for sale on Geartrade at the moment. I did put them on the sale section if interested.
Thanks for the offer but, I've decided to send it in to be rebuilt.
 

canis2022

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Okay, I know nothing about that bike but the pack looks like a pretty standard setup (not one of the built into the frame or other types of insanity).

I have an ancient incandescent spotlight that runs on 48v which I only keep around to create a load for battery packs so I can test for bad cells. If you have a Batteries+ store or something like that I'd bet they can run load test(s) and see where you are at. They can probably even rebuild the pack. (hint, if you can get panasonic cells DO IT!)
I did call our local batteries plus store about testing and possibly rebuilding an ebike battery but, they had no idea how to proceed. The guy said he would call his corporate office and get back to me.... he never did. I mailed the battery to FTH Power to have them rebuild it and I'm now waiting to hear back for them as far as how much they would charge to repair it. When I have more information, I'll do a review of FTH and the final outcome.
 
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