Youtor
Fullriver LiFePO4 32700 32V 5400mAh Rechargeable Batteries
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=a9PyKng3DO8
0:00 This is a battery box for 5x 12v20ah SLA batteries. • 0:15 But inside is a 20s6p 32700 LiFePO4 battery • 0:21 The two black wires are to turn on the ANT BMS so we need to untie rhem. • 0:53 Remove the 10 screws holding the cover on • 3:06 Carefully remove cover, watching the power lines to the socket in the cover. • 4:20 Remove (-) wire • 5:23 Remove (+) wire • 6:36 after removing the foam sheet care must be taken not to drop anything metal on the copper busses • 6:58 only 12V but it will still cause a big spark and burning if you short it. • 7:22 The ANT BMS app showed us #2 group has a problem. #1 is on top and #2 is directly below it in series • 9:05 using foam to help prevent a short if a tool is dropped • 9:17 we must remove the #2-#3 series-parallel bus, so 6 screws (+) and 6 nuts (-). • 9:44 this is a 32700 LiFePO4 cell. Not a LiPo. Lol • 10:00 right now all cells in group #2 are connected in parallel so we can’t see which is dead until they are isolated. • 10:52 we need to remove the balance wires because they are blocking the polycarbonate sheet. • 20:13 now with (-) lead on the (-) buss we use the (+) lead to check each isolated cell voltage. • 20:25 and heres the bad one, voltage dropping like a rock. • 21:20 remaining the dead cell • 24:11 putting in new cell • 27:13 new cell was discharged to 3.2v which is what the pack was last balanced at before a charge. This will cause this group to have same voltage as the other groups after it equalizes through the parallel bus. • 29:06 reinstalling the series-parallel bus • 34:00 tighten the nuts lightly to prevent snapping off a post. • 36:43 replace the balance leads. • 39:57 taping the balance wires so they don’t get pinched under a nut or screw head. • 43:20 this foam is mainly for padding because its the bottom of the battery. • 44:58 touch the 2 black wires to turn on the ANT BMS • 45:27 no errors and all cell groups look normal • 1:03:49 using RTV to ensure no water can get inside while driving in the rain • 108:59:00 The battery is so light and easy to work on that a small Filipina did 99% of the work
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