More Info:
This battery was used in the telecom industry and is replaced after a certain amount of hours used. The outside of the case says Panasonic, but there are Sanyo cells inside. They are the same company. The BMS is a tricky one, it has a built in power shutoff that is quite interesting. There is a thermal link that the BMS burns up to prevent use of the module after the BMS decides it’s time to be replaced. Can be easily bypassed of course, which makes these batteries a prime candidate for second life. We have not had any luck engaging the BMS, so it is sold as non functioning. The BMS is very easy to desolder and remove, you can also cut the voltage taps if you don’t have a soldering iron. The whole pack comes apart with a phillips screwdriver and a security T10 bit, long and narrow bit would make it easier. If you plan on removing cells, you will need a Security T9 bit as well.
We think the BMS may be slowly draining the batteries. We will check the voltages of the cells before sending them out, but if they are being discharged and you store them for a few weeks, you could have bad ones by the time you get to them. Please disassemble and disconnect the BMS once you get them to ensure your batteries dont go bad.
This module comes apart in two sections, 7s and 8s. The busbars are on philips screws for the two modules, splitting them apart is a matter of unscrewing screws.
We tested a module and got 38.6Ah.
Shipping
We can ship these individual modules ground, but the lot of 50 modules will need to be shipped freight. We will need to ship the freight pallet to a commercial address, local freight hub, or picked up from one of our many locations. Freight shipping for this listing is free!!
Specifications
Nominal Module Energy: 2kWh, 37.9Ah Max Module Voltage: 63V
Nominal Cell Capacity: 2.5Ah Nominal Module Voltage: 55.5V
Module Configuration: 15s17p Min Module Voltage: 37.5V
Peak Discharge Current: 25A Max Cell Voltage: 4.2V
Nominal Discharge Current: 8.5A Nominal Cell Voltage: 3.7V
Peak Charge current: 25A Min Cell Voltage: 2.5V
Nominal Charge Current: 8.5A Weight: 38lb
Length:18.75 inches
Width: 7.75 inches
Height: 6.25 inches
Janis Buikauskis (verified owner) –
I have now purchased 3 of these. As mentioned, they test out at 2.2AH during a 1 amp load test.
These are in a bunch of my kids and friends kids electric toys. The packs are simple to dismantle.
At 20 cents per cell, these cant be beat unless you need lots of AH. Building high voltage packs gets iffy as they take lots of space to get the capacity / discharge rate. These cells appear to be good for 2c discharge from testing. I do my pack calculations at 2.2AH and 5Amps per cell. Largest packs I have built with great success are 10s 11p for a 36V 24AH. Last project was a pair of 36v 500watt kids electric ATVs. Compared to using heavy 12 v 12 ah SLA batteries, the ride time is much longer due to reduced loads from the weight shed and increased capacity. Next project will be a 60V 2000 watt battery pack for an electric dirt bike. Will be a 16s 7p. I can make two 60v 15 AH battery packs good for ~ 2000 watts from a single $50 pack.
TLDR : These are great unless you need maximum AH/Amps in a limited space.
noah.burke.2009 –
Great product for the money! Just be enlightened these cells are in fact sanyo 2.5 Ah cells BUT they are slightly used and now test at 2.2 Ah. Still the best deal I’ve seen on reputable cells.
Luis (verified owner) –
Just as advertised. Thank you. Great communication. Will be back for sure.
Joe Bontrager (verified owner) –
I ordered the first battery skeptical because of dealing with other sketchy companies in the past.
This first battery and transaction was perfect by all means, above and beyond my expectations.
I ordered a second with the same experience.
This is my go-to company for all my battery needs going forward.