Replace Ebike battery
I have to replace a battery samsung 35e sd1 2g2s does it have to match exactly
I have a spare icr18650 samsung 26d sdi and a lgabd11865 n116d268af https://cimg0.ibsrv.net/gimg/bikefor...ce3ff8b337.jpg https://cimg1.ibsrv.net/gimg/bikefor...2597c17001.jpg |
A 26D is 2600maH and a 35E is 3500maH. You will reduce your batteries capacity by 0.90AH.
Even though you're only doing one cell, the battery capacity is determined by its weakest cell group. This cell will pull the other cells around down faster, and the group that it's in will hit the low voltage limit sooner, and shut the battery down. When you recharge it, the group will spring back to full voltage but will again be the first group to run out. The math is easy. It's 900AH lower, |
What about this battery instead 6800mAh
https://cimg5.ibsrv.net/gimg/bikefor...d615178371.jpg https://cimg6.ibsrv.net/gimg/bikefor...68faeb561d.jpg |
Since, AFAIK,Samsung and other well-known battery manufacturers have a 3500 mAh max for their batteries, IMO someone at Ultra was smoking contraband when they wrote the specs for that battery.
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I bought a video doorbell, and it said I had to use these batteries I bought 4 not cheap I just noticed the doorbell is dead not long since charging.
Is there an easy way to test? It should be better than the other 2500 mah. I have seen some test on YouTube the Chinese batteries do about half what's stated or less |
I haven't had the need to test, but it's easy with the proper equipment (some use a known quantity like a light bulb to measure). Look at batteryuniversity.com or maybe DW can help.
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Originally Posted by Bigbadjohn
(Post 22059812)
What about this battery instead 6800mAh
https://cimg5.ibsrv.net/gimg/bikefor...d615178371.jpg https://cimg6.ibsrv.net/gimg/bikefor...68faeb561d.jpg |
Originally Posted by Bigbadjohn
(Post 22040386)
I have to replace a battery samsung 35e sd1 2g2s does it have to match exactly
I have a spare icr18650 samsung 26d sdi and a lgabd11865 n116d268af https://cimg0.ibsrv.net/gimg/bikefor...ce3ff8b337.jpg https://cimg1.ibsrv.net/gimg/bikefor...2597c17001.jpg If it is one of the batteries in a pack, it is smart to use a battery with the same (or similar) amp hours or what hours, so that it discharges at a similar rate to the others. It will probably be easier to fit physically if it is the same size. |
Originally Posted by Bigbadjohn
(Post 22040386)
I have to replace a battery samsung 35e sd1 2g2s does it have to match exactly
I have a spare icr18650 samsung 26d sdi and a lgabd11865 n116d268af https://cimg0.ibsrv.net/gimg/bikefor...ce3ff8b337.jpg https://cimg1.ibsrv.net/gimg/bikefor...2597c17001.jpg Most likely the batteries are the same. I would put a volt meter on the new one, just to check. |
UltraFire has always lied about their batteries. You probably need three of them to get 3.5AH. but one will likely fail and kill the whole pack.
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Originally Posted by alo
(Post 22060239)
Does anyone know what the codes on the batteries in the picture mean? They are probably manufacturing batch numbers.
Most likely the batteries are the same. I would put a volt meter on the new one, just to check. |
I put the ultra fire in a cheap led flashlight left it on over night 8 hours it was very dim in the morning used another battery reclaimed from a laptop forgot about it was left on 12 hours was much brighter
Bought a doorbell camera said I must use 6800 mah I did not know anything about batteries at the time, was not easy to find such a battery I think Ultra Fire is the only company that makes them never use Chinese batteries. Me thinking I am getting this incredibly battery not so |
Originally Posted by Bigbadjohn
(Post 22062105)
Me thinking I am getting this incredibly battery not so
|
Last fall I noticed a considerable loss of range, but did nothing about it during the winter. This spring it became worse, even to the point that the system would shut down due to voltage drop under heavier loads like a long hill. It was time for new battery, but I thought maybe I could just replace a few cells. I charged the pack, took it apart and found 8 of the 40 cells were in such bad shape that they would barely register on a voltmeter. Seems like almost one whole series string was bad. Makes me suspect that there may have been an issue with the BMS rather than the cells as the remaining 32 all seemed fairly uniform.
So instead of rebuilding, I just replaced the whole pack with a new 50 cell unit with 25% more capacity. That increase sure works well on the tough hills, and the range is considerably better than the previous pack ever was. I wound up with 32 18650 cells that all measure over 4V at full charge, so I bought a small charger for them and replaced all my old D-Cell flashlights with units that use 18650 cells - so far they seem to be performing fine, so it will be a while before I ever buy flashlight batteries again! Too bad I can't do the same with all the various battery-eating remote controls in the house. |
They work great in flashlights I have a few with 18650's in
It would have been an easy job replaced those 8 with good cells then you would have had a good battery to connect in parallel |
Originally Posted by Bigbadjohn
(Post 22072856)
They work great in flashlights I have a few with 18650's in
It would have been an easy job replaced those 8 with good cells then you would have had a good battery to connect in parallel |
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