Direct lead battery replacement by LiFePO4

Chat about all things battery in here.
Need to know what type to use or size or capacity then again place your thoughts here
Posts: 10
Joined: Wed Nov 20, 2013 12:16 pm

Direct lead battery replacement by LiFePO4

Postby jumpjack » Fri May 30, 2014 7:24 am

I read on datasheets of some 12v LiFePO4 packs that no more than 4 of them can be connected in series "due to internal circuitry limitations".
Does anybody know why this happens? And why do not all of the 12v-lithium-packs manufacturer write this in the datasheet? Missing this info, how can I figure out if a specific pack can be connected to 3 or more in series?

Which sites do you suggest for buying direct-replacement LiFePO4 batteries in Europe? (For traction, not for startup).
I'd need them for an old 48V Oxygen Lepton e-scooter.

Posts: 870
Joined: Tue Apr 01, 2008 5:27 pm
Location: Galashiels, Scottish Borders

Re: Direct lead battery replacement by LiFePO4

Postby GregsGarage » Wed Jun 04, 2014 8:27 am

It will be because of the voltage ratings used on whatever bms circuitry is built into their 12v batteries. They probably have some ~60 volt rated components so that is what limits you to 4 (12 volt) batteries in series.

Lithium cells must never be over or undercharged. Even one occurrence will probably kill your investment. I recommend a bms that will prevent that from happening. All cells should be monitored individually, pack voltage is not a good enough indicator.


P.S. I have a spare 16 cell minibms system available. PM me if interested.
Greg Fordyce

Daewoo Matiz

Return to “All things battery related”

Who is online

Users browsing this forum: No registered users and 19 guests