(Part 2) Top products from r/batteries

NI-MH batteries are around 1.2 volts per cell. A battery holder like the one I linked will wire them in series. So the 10 cells together will give you about 12 volts.

Here is a link to some battery holders that already have lead wires attached.. If you fill them with 10 NI-MH batteries, you can just wire to the leads for your 12 volt connection.

To make this work, of course you will need some good NI-MH cells. I've been really happy with Eneloops like these though I'm sure others in this sub know more than I do and could give you other good recommendations.

You will also need a charger, and preferably one that can handle at least 10 cells at a time. I've had good luck with this one from Tenergy, but again you might want to ask this sub for recommendations. There are lots of people on here that have more experience that I do. Good luck with your project!

yes absolutely.

you may lose some life if you don't use matched cells but this is COMMON

RC Car battery packs (before lithium) worked this way.

you had 7 and 8 cell sub c cell packs. any of those chargers will charge your pack just fine.

charge at 1amp should be plenty safe a decent charger will auto detect full and stop.

do be sure to charge them separately the first time then discharge and charge "as a pack" only so the cells don't mismatch.

this will work just fine

http://www.amazon.com/gp/product/B003MXMJX8/ref=pd_lpo_sbs_dp_ss_2?pf_rd_p=1944687602&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B002PECWXC&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1SVXNCYT30XW7S7HEZA8

and it is cheap too. you should be able to get away with a 2amp charge if your using 2amp hour or better cells.

>with 75min reserve capacity... yet it only has 66min reserve capacity.

That smells like an advertising gimmick, if you test it after charging the battery to 15.0V or 14.5V down to 10.5V then obviously you get longer service, I wouldn't worry too much about that.

>Whats the best deepcycle 12v battery i can get.

You could look at the size of the battery tray under the hood (and available height) if a larger battery will fit, that should improve reserve capacity.

Another thing to look at is the number of charge/discharge cycles, ...and 300+ discharge/recharge cycles, cheap to buy could mean expensive to replace often.

Ah I see. Your english is far better than my italian btw.

At least in the US rechargeable 9V is a lot cheaper. I use these and they have performed great. Low self discharge and 8.4V nominal. Tenergy is a chinese brand so it should probably be possible for you to find them for a reasonable price somewhere?

>Optimally I'd like to get batteries which would allow me to plug them in to wall power and simply forget about it

Eh, sounds a bit like the X-Y problem. So if I get this right, what you really want, is a 1.5/3/4.5 volt DC adapter that you can use instead of batteries.

Something like this, soldered to the battery tabs.

Oh it's actually a full size upright vacuum not a handheld one.
https://www.amazon.com/gp/aw/d/B00008URRT/ref=cm_cr_arp_mb_bdcrb_top?ie=UTF8

The advertised runtime is 30m so I was hoping to retain that or even improve it.

Batteries haven't swelled at all. They are reading 13V.

i did move them alittle to bring them up stairs and i wired them up.

I purchased this charger:

http://www.amazon.com/gp/product/B0000AXTUY/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

Seems hopeful. Maybe i have charged them in the past year.

*Edit: I plan on hooking these up to a inverter this weekend so i can play videogames in the park for a few hours. Will i be able to?

The one I use looks like this:

https://www.amazon.com/Cobra-CWAP135-Microport-Continuous-Inverter/dp/B00IZGXV7U

No cables in the way or anything, and it is cheap. Yes kid could still yank it but that's the same as with the USB stuff. I wonder if your 15v adapter can run on 120 volt input instead of 220. Lots of those things are universal voltage.

Does the car itself have speakers? Wonder if you could just wire up to those somehow.

Ah then you're in luck! In my experience, if you hit right voltage for little electric motors like this, they'll turn. If you can't supply enough power, they'll turn slowly but they'll work. Also, again these batteries might not last long (I would imagine minutes, compared to hours for AA batteries). I'm not sure exactly what you're looking for as a form factor but here are some options for small, high power, 3V batteries:

http://amzn.to/2r4m5yX

http://amzn.to/2sCz5xY

http://amzn.to/2s2JHZV (not necessarily high power but it might work)

For low voltage batteries, I recommend Barsukov's book (from Texas Instruments); "Battery Power Management for Portable Devices"

Here your go: only 1kwh https://www.amazon.com/dp/B004LPIYJ4/ or here is one with 3.2kwh https://www.amazon.com/dp/B01M61VLBZ/

https://www.amazon.com/Enersys-Hawker-Cyclon-0810-0004-Battery/dp/B0002ILK86

https://www.amazon.com/gp/aw/d/B07TVLKMH6?ref=ppx_pt2_mob_b_prod_image&th=1&psc=1

> 4x AA NiMH

Are these rated at 1.2V? Doesn't specify on the page. If that's the case, then I would need 7 of them to make it over 7.5V.

Just curious though, what's wrong with this one?