2 Volt SLA battery charger help?

[czwalga]

Alright, i've posted here before about this... but i'm having some trouble.

The battery is a 2 volt 5 amp hour SLA battery. I have a 12 volt sla battery charger (with a cutoff)... and was going to attempt to a circuit to charge my 2 volt battery along with my 12, however i'm not sure how.

I've looked I havnet even beenable to find a 2 volt SLA charger to buy.



Suggestions would be appreciated.

 

[Papabravo]

What does the manufacturer of the battery have to say?

 

[czwalga]

**broken link removed**


Sadly not to much. I read the info about the battery but its not really useful to me.


Its a 2volt hawker cyclone.

 

[Papabravo]

I disagree. I found the following application note on charging and discharging Cyclon batteries. At 58 pages,it seems pretty substantial to me. There is at least enough information to evaluate commercial chargers.

https://www.electro-tech-online.com/custompdfs/2006/04/US-CYC-AM-005_060420Application20Manual.pdf

The ones this company sells appear to be for data center or server farm applications. You might wish to contact them directly and ask if they have a suitable charger for your application.

Good Luck

 

[G8RPI]

Hi,
You can make a charger for a single Cyclon cell using an LM 317T
see https://www.electro-tech-online.com/custompdfs/2006/05/LM117.pdf
in particular page 19 "12V battery Charger"

Replace R2 in the circuit with a 180R resistor and 100R preset in series. This will give a range of around 2.2 to 2.7 Volts.
To adjust, connect a 100R resistor across the output and adjust for between 2.45 and 2.50 Volts for a cyclic charger or between 2.25 and 2.30 for a float (on for >48 hours) charger.

Optimal input voltage is around 5V but the input to your 12V charger can be used, you just need a bigger heatsink. Note he tab is not ground, if using the chassis as a heatsink use an isulating washer etc.

Robert G8RPI.

 

[dneaderhouser]

2 volt charger

Hi,

I use a transformer that has steps for 6 voltages from 1.5 to 12 volts.

An example is the following website:

**broken link removed**

or do a search on "12 9 6 volt step transformer price". I found mine at an electronics parts store.

Mine has a limit of 1 Amp. I monitor current with an analog meter I got at an electronics store. Also I monitor voltage. By selecting different steps on the transformer I can do a rapid charge (up to 1 Amp) or a trickle charge. The specifics depend on the specs for the battery.

 

[Gayan Soyza]

The cheapest & efficient way is Robert G8RPIs method.The constant voltage type is good for me to charge SLA batteries.I have a similar charger to charge the SLA batteries using this voltage regulator IC.It gave me good results.

 

[Hero999]

I would use a switching regulator supply to convert the 12V to 2.3V - a MAX649 might do.