I am not aware of any reason why the BN batteries can not be series or parallel connected - something that is important is that little grey sticker with the “1075-4” number on. These are batch numbers as far as I know so, batteries should be from the same series if you want to series/parallel (the batteries should all be from the “1075 group” (1075-4 & 1075-32 should be good but 1075-4 and 1076-4 not). I believe this should help have less variance between cells.
When I originally asked BN (more than 2 years ago) about series connetion this was the response:
For Series configuration preparation:
Charge each battery individually till they are all fully charged.
Connect all batteries that will be in the same series string in parallel, and charge together till they are full.( draw less than 1Amp from the charger if this can be measured).
Connect in series and charge with your series configured charger. Please take note of the batteries charge voltage and current specifications on our website, as this would be crucial for your warranty.
Parallel Configuration connection:
Charge each battery individually till they are all fully charged.
Connect all batteries that will be in the same parallel string in parallel, and charge together till they are full.( draw less than 1Amp from the charger if this can be measured).
Connect to your charger for parallel configuration.
Please take note of the batteries charge voltage and current specifications on our website, as this would be crucial for your warranty.
I suspect a problem with “dumb” (non-communicating) batteries epecially when people start paralleling is that they believe they can also increase charge/discharge rate and then start popping BMS’s.
assume you referring to the requirement of a balancer? More and more of the “drop-in” replacements are starting to specify the requirement. I have two series connected BN 8Ah batteries running the garage door motors and they are definitely sitting at different voltages ( I will still check them out in more detail at some stage to see if I think the absence of a balancer is/was a problem).
Methinks, I’m not going to use 12v Lifepo4 cells in my 48v APC. Too much hassle and the costs are not to be ignored. Worst case, I can use the big bank.
In the meantime, as LS is back, I got 4 x 12v 7ah for like R876 for now. I need protection for the fridge/freezers and against myself.
FWIW, on my 24v 700va APC, this bank has been in it for like 2 years. Was cheaper at the time than 4 x 12v batts it needs.
anyone waiting in anticipation of more results from the santarama mini-land equivalent of the Australian battery test…
the 11Ah Bluenova mentioned earlier in this thread (i.e. about 2.5 years old but only charged once or twice and not seen any active use) appears to have a capacity of around 10.3Ah.
So after roughly 24 months,
* List item
two 8Ah batteries that were kept separately at float of roughly 13.5V have a capacity of ~7Ah.
one 11Ah battery stored at full charge, have a capacity of ~10.3Ah
the 8ah degraded within expectations, I really expected the 11ah that was stored at full voltage to degrade with at least 10% over the time period.
now I wonder if the 11ah will recover some capacity if you cycle it a couple of times?
the 10.3Ah might have an element of recovered capacity (got just under 10Ah on discharge but 10.3Ah on charge). Doubt I will go through any effort to see if there is anything above the 10.3Ah
Hi, does anybody know about a 6V LiFePO4 drop-in replacement?
We have one of those small kiddies battery-powered sit-in toy cars, and it uses a 6V lead-acid battery. Between kids using it and grandma charging it, the battery do not generally last very long and I can already see the replacement is moeg.
Was wondering if I could replace it with a LiFePO4 battery…
(sorry, will remove the bracket and take another pic)
You can always put 12V in there and watch them goooooooooooooooo
There are 6V LiFePO4 batteries aimed at classic motorcycles but probably 2 problems being form factor (not going to fit that space) and price (probably at least same price as the toy car).
Think @stok builds batteries, maybe he can put something together for you? (disclaimer, I do not know stok from a (bus)bar of soap and putting forum members together where money is involved is probably as dangerous as mixing family and business).
LiFePO4 batteries in that form factor on aliexpress (cheapest shipping total about R1500, excl duties etc. or incl UPS shipping about R2500 excl duties, etc.) seem to be limited to around 5A continuous current - wonder if it is enough for that motor?
There’s actually a thing online to upgrade these to higher voltage systems – haven’t watched it yet. Usually to actually get a boost in the performance.
My experience is this SLA battery is a good one compared to the 12V 7Ah. I’ve had 2 of these for years and they still hold a charge… (maybe I looked after them properly?)
The current 6v battery measured 4.2v open terminal when I checked - so probably already fairly destroyed. I can’t really imagine a toy like this has proper battery management (either on the charger side or the DoD management), and combined with a clueless grandparent (grandma bought the car and the kids drive it around at her place) it’s probably long gone.
This is the sad reality of lead acid batteries. Unless the owner religiously plugs them in to charge whenever they can (regardless of DoD!) they will deteriorate in front of your eyes.
My charger is ready to charge any battery that has been used for any purpose no matter how little!
Did you change anything around the car’s charging circuitry (or likely, the lack thereof)? Unfortunately my Victron Blue Smart charger is only 12v, and I measure the voltage output of the car’s AC-DC adapter and it is way beyond 6v or 7v - more like 10v.
