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  1. P

    How to get Li ion batteries to work in (SLA) UPS

    Repurposing APC SmartUPS (SUA1000, SMC1000 etc) for home appliance backups (fridge, mom's oxygen machine etc). Hi all, My apology, I know this is not directly related to endless, but I couldn't find another place with as much educated and helpful and kind members. I (re-)searched this subject...
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    Santa Monica spot welder

    Hi there, looking to borrow/rent a spot welder in Santa Monica (and surroundings) to connect eight 32650 batteries please. Am sometimes in San Bernardiono also. Thanks!
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    Replacing a 12V 7Ah SLA battery with 14.4V 12Ah keeping SLA's dimensions

    Hi all, my first attempt to put together some batteries, so please be helpful and kind. I was looking to replace a 12V 7Ah SLA battery and found ready made batteries but with low Power or other issues. This should replace a standard 12V 7Ah SLA battery and has eight 32700 6Ah LiFePo4 batteries...
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    13s4p BMS or 4x4s BMS ?

    Hey all, happy(er) and healthy(er) New Year! I haven't been around for a while, so much has changed! DrkAngel's index is huge and even more amazing! I searched and this question was asked often, and I'm sure you gurus are tired of these type of questions. Reminds me of Life of Brian (out the...
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    Actual size of HXT 2mm and 3.5mm and EC2 Plugs?

    Hi all, I'm looking desperately for the outer dimensions of the https://hobbyking.com/en_us/hxt-3-5mm-gold-connector-w-protector-10pcs-set.html https://hobbyking.com/en_us/hxt-2mm-gold-connector-w-protector-10pcs-set.html https://hobbyking.com/en_us/ec2-male-battery-connector-5pcs-bag.html as...
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    What are these pads on my controller?

    I have this 48V controller for my scooter, and don't know what the many unconnected pads with letters mean/do. Even the CPU is a mystery, "OC062, B1A9"??? I did research this board and the world for similar pad names, but came up empty. Except the 60/120 angle thing, that I got. Could you...
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    Which parameters show a cells capacity (V/A/IR/temp)?

    I try to identify the parameters needed to match twelve 4s1p packs arranged as 12s4p. The goal is to match these packs in the most optimal way so that the (4xparalleled) cell capacities of each of the 12 (serial) stacks are as equal throught the stack as possible. How that is done is another...
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    Turnigy 4mm HXT vs Hobby King 4mm HXT

    This is some info about 4mm HXT connectors. It drew me crazy not finding the right info on these. The pins would on some places/videos be insterted from the rear, others from the front. Turns out both are right in a way, depends on who's HXT connectors you have, seems that there is no standard...
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    Controller upgrade: worth it?

    This in my existing controller that came with the scooter: http://endless-sphere.com/forums/viewtopic.php?f=2&t=53324#p793681 and everything runs smooth with a 12s configuration. A little too smooth because with 12s4p (12x5Ah LiPos) the voltage drops to 44V and that is indeed slower than the old...
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    Replacing shunt FET

    Hi all, so I have this SmartBMS and learned that they use the single FET in the picture as a current shunt. I would like to draw more power, but don't have a matching 100V/92 FET. I do have lower A FETS with the same internal resistance of 7mOhm. I would like to swap the shunt FET with my...
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    HK hardcase packs preferred direction

    I there a preferred direction for HK hardcase packs? I searched and could not find anything, not even a specsheet for LiPo hardcase packs. Something like these: http://www.hobbyking.com/hobbyking/store/__18631__Turnigy_5000mAh_4S1P_14_8v_20C_hardcase_pack_USA_Warehouse_.html I see that the...
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    Horrible quality of SmartBMS from bmsbattery.com

    I got 2 SmartBMS (Smart BMS 5~13 Cells in Series) from bmsbattery.com through an ES member. http://www.bmsbattery.com/smart/330-lifepo4lithium-ion-smart-bms-for-513-cells-in-series.html Most parts looked hand soldered, so I inspected them thoroughly. I noticed several shorts and there were part...
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    BMS heat?

    Can I put a SmartBMS plus battery pack into a quite closed box? I have this battery box holding 4 SLA batteries to power my scooter. I might replace those SLA with 13s4p LiFePo. The battery box is very inaccessible and beneath the foot rest area of the scooter. I would love to put the...
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    onboard charging/balancing solution

    Hi all, I am considering LiFePo4 instead of 4x SLA batteries on my scooter. I also am getting 2 SmartBMS (set to 12s lipos, which I probably need to reprogram somehow). Having plenty of space -weight is not a problem, too- I want everything to be on the bike and as easy to operate as can be. I...
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    CellLog & rotary switch: switch packs & disconnect

    Hi, reading about the CellLog, this amazing gadget, I learned that it's best to completely disconnect it if not in use. Considering that I have up to 3 packs to be monitored, I thought using a rotary switch to be able to switch between the packs and even disconnect the CellLog completely. Has...
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    low ESR cap behind shunt resistor??

    I am enhancing my controller and noticed a weird thing: There are 2 x 470/50V caps connected directly to the + and - of the incoming battery wires. From there, in the - path, there is the shunt and behind that is another (same type) 470/50V capacitor, located at the FET power "bus". Exactly...
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    Headway or A123?

    Hi there! this is/was my scooter http://endless-sphere.com/forums/viewtopic.php?f=2&t=49287 And I got me another (newer model) G-Bike POS for $175 after mine failed http://endless-sphere.com/forums/viewtopic.php?t=51841 They can be had really cheap, they fail quite often because of cheap...
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    Do rear hub motors fail

    Do rear hub motors fail under normal use? No overclocking or overvoltaging etc, just regular use. I have a g-bike and was wondering if it is possible that the motor is failing? http://www.shopgbike.com/products/city/yellow.html We checked the controller, used another one, checked wires...
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    G-Bike City- Electric Scooter 48V dropping out

    Hi there! I got me this (used) G-Bike City- Electric Scooter http://www.shopgbike.com/products/city/indigo.html And it has the issue that it sometimes does not accelerate! As if it is hesitating. And when I turn the throttle a few times, it suddenly kicks in. It has a controller which I...
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