Electric vehicle batteries and chargers

I own a Huasha HS50QT7 electric scooter with a 1.5kW motor. It was powered by 4 Greensaver 12 v 38ah Silicon Lead acid batteries connected in series, with a household circuit breaker in circuit. The range was poor as two of the four batteries are shot, so I inquired with many manufacturers and bought a 48V 30ah LiFePO4 battery and charger from yxmzone. This was the largest capacity, at the time, that would fit in the battery bay (with a club hammer and cold chisel).

I own a Huasha HS50QT7 electric scooter with a 1.5kW motor. It was powered by 4 Greensaver 12 v 38ah Silicon Lead acid batteries connected in series, with a household circuit breaker in circuit. The range was poor as two of the four batteries are shot, so I inquired with many manufacturers and bought a 48V 30ah LiFePO4 battery and charger from yxmzone. This was the largest capacity, at the time, that would fit in the battery bay (with a club hammer and cold chisel).

for my Cyclone trike, I've put a pack together:

4 x 3 (yes,three)-cell 5Ah lipo for 11.1 volts nominal at 20 Ah in series with another identical pack.

Is this better than using 2 in series (22.2 volts nominal at 5Ah) in parallel with 3 more identical packs?

My reason for this is to get a dirt-cheap 'graceful fail' mode for my trike.

Or does anyone have better ideas?

HI
I have a very useful electric bike made by the EZEE company. The LI-ion 36V 10AH battery is dead and a new one costs more than I paid for the bike. I would very much appreciate advise on how to obtain and fit new cells to re-build the battery. If I can improve the 10AH capacity at the same time that would be great.
The battery looks like this!

http://www.electricbikehub.co.nz/wp-content/uploads/2011/04/eZee-replacement-battery.jpg&imgrefur

colin9876 (http://visforvoltage.org/user/colin9876) has sent you a message

Message:

Hi Mark,
Reading ur post answer today (about the cells unbalanced), good answer.

hi..

I have got a modified bike with a front wheel running on 36v sla agm batteries. 3 x 12v.

I used the charger that came with it and one time I forgot it.. it over charged. batteries expanded and I think I got hydrogen. they were very hot.

I was very scared. I replaced Bart's with news ones. got a 36v soneil charger.

I put a voltimetre on the 36v terminals when its charging. I read 43.3.. still charging. isn't that a high voltage when a full 12v charge is about 12.8v?

I am right now pricing to build an electric bike using a 48v brushless hub motor, and I am looking at 16x 40ah batteries from Thundersky with a BMS. I predicted all the prices except for the BMS, it seemed quite expensive. What is the best BMS for an escooter that is running on such a motor?

Thanks...

I am considering buying a Zapino. They are offering $1000.00 on demo rides, but with no warrenty. I've been looking at everything I can find about them and my big concern is the battery charger. It seems from what I read, that the OEM charger is a series charger. And that is not giving a balanced charge to all the cells. Somewhere I read that the 1st and 4th cells are somehow receiving a lower charge. Does anyone make a parallel system? Or is it possible to switch the battery connections to vary the order of the cells?

its for a 48v 12ah Lifepo4.... thanks! i have been having the most frustrating time locating one anywhere on the net..... :(

Greetings,

First of all excuse my ignorance when it comes to batteries, etc. I currently have two ebikes but know very little about how to repair/charge the batteries using a single cell charger. I have a Ping lifepo4 48v 20ah battery. Ping recently sent me a single cell charger to assist in balancing the battery cells. Ping sent a diagram but I was hoping someone who has a single cell charger and a ping battery can post photos/video of how to properly connect it. I took the battery to a hobby shop and all they did was short circuit my bms for me.

I'll include a link to a youtube video showing the photos of the single cell charger connectors, diagram sent by Ping, and the new bms that I'm having a local electrician solder on for me, hopefully tomorrow.

Thanks in advance.