Do you have size constraints ?

What battery type? Different batteries will need different chargers.

Charging 2 batteries in series is not the best idea, one battery may charge faster than the other leaving the other battery under charged. The same issue happens in multi-cell LiPo based batteries hence the use of a balance charger and balance port.

You'll want 18A for the battery to charge in an hour which is quite a lot, my biggest charger is only 5A, the one I use most is less than 1A (I think it's 850mA - and it takes ages for my 5000mAh LiPo to charge!).

Also, be aware that charging too fast can cause the batteries to over heat. If they are SLA batteries they charge better if you charge them slower too. If LiPo they have less chance of going boom and increasing their life.

So not exactly advising any chargers but some food for thought.

If this is for powering the wheelchair motors we have been discussing, then you will want either sealed lead acid or gel cells (@jstarne1 has posted good links in earlier discussions, so you can either search for his posts or maybe he will chime in), and you can pick up a charger for electric wheelchair from eBay for not too much that would do a good job. I got one for $35 or $40, brand new, from an eBay seller. It came with a 3Pin Amphenol connector, and I picked up an Amphenol jack at Radio Shack, but you can always cut the connector off and make your own connections, or just solder on some big alligator clips to connect directly to the batteries.

Alan

Canadian Tire sells small motorcycle\snowmobile battery charges (for 12v SLA or gel batteries)....

Josh uses/recommends PowerSonic SLA batteries.

Rich, I never said I would be charging in series. I don't mind if they take a while to charge.

ww321q, No I don't.

rryerson, Thanks for the info.

thetechguru, yes I am, and i'm looking for a cheap battery/charger combo I can get 2 of to run the chair.

looking at these batteries, but have to get chargers for them. Yes? No?

www.ebay.ca/itm/UPG-2-Pack-12V-18AH-BATTERY-BOOSTER-PAC-ES2500-SLA-VRLA-RECH-/190931572276?pt=US_Rechargeable_Batteries&hash=item2c74689634

What charger should I get?

You charge in parallel and optimal charging rate is 2.5 amp per battery. So a charger that puts out 4-5 amps will charge two at once at a ideal rate. Each battery has a charge rating, min, max and optimal. The power sonics do great on a 2 - 2.5 amp current. You can charge them faster But it reduces the overall batteries life. Don't try charging a 9 ah battery more that 1C which is 9 amps. For a 7 ah battery @ 1C that's 7 amps and so on.