Accupower Evolution vs. MAHA Powerex "D" batteries???

2nd2none

Newly Enlightened
Joined
Aug 6, 2004
Messages
51
I am looking for obviously the best "D" batteries, Seems like a lot of people go with the 10000mah Accupower's are these better than the 11000mah Powerex "D"'s???
 
Last edited:

Turak

Newly Enlightened
Joined
Jul 24, 2007
Messages
171
The Accupower 10,000's are LSD (Low Self Discharge) type batteries. I would definitely get those over the slightly higher (11,500mAh others) regular NiMh batteries. Also, they are actually the same price or cheaper than the regular NIMh D cells at the site I was looking at.

The regular NIMh batteries will quickly lose that extra 1,500 mAh of capacity due to self discharge....probably overnight.
 

2nd2none

Newly Enlightened
Joined
Aug 6, 2004
Messages
51
Thank You, I thought the Accu's were better from discussions a while back, thou I couldn't find them...
 

Greg G

Enlightened
Joined
Oct 17, 2007
Messages
772
My only complaint with the Accupower D's is that the bottom (negative) end of the battery is weak and the "tit" on the positive end pushes them in while installed in the light. This was with a cut down M@g spring as well.

I expected such an expensive battery to be made a little more sturdy than that. Probably won't be buying any more and will stick with AA's (Eneloops).
 
Last edited:

Phlack

Newly Enlightened
Joined
Aug 6, 2003
Messages
106
I'm thinking of getting myself some of the AccuPower D LSD's too.
Any other opinions on whether those connections are weak or not?

-Mike
 

Greg G

Enlightened
Joined
Oct 17, 2007
Messages
772
Here's a pic of three of my Accupower D's showing how soft the bottom pads are. They still work, but I wonder if the material inside the battery being "crushed" is hurting their capacity or will reduce their lifespan.


ry%3D400
 
Last edited:

etc

Flashlight Enthusiast
Joined
Dec 19, 2004
Messages
5,777
Location
Northern Virginia
Now that you show it, mine look exactly the same way. I looked at CTA ones and they also look just like that. My guess is, it hurts nothing.
 

NotBrightNuf

Newly Enlightened
Joined
May 2, 2009
Messages
48
I read nimh battery shoot out posted by silverfox. He tested an accupower 11500mAh and it can handle a 10 amp draw pretty well staying just under 1.2v. Im not sure if the same goes for the lsd version of the accupower d cell.
 

shredmandan

Newly Enlightened
Joined
Dec 4, 2012
Messages
4
You might want to look at the Tenergy "PREMIUM" Nimh batteries - after extensive research on the web these seem to be the best rechargeable D cells on the market at present (BEST BANG FOR THE BUCK). Tenergy also makes another D cell battery that is NOT labeled "PREMIUM" for about the same money but I don't think quite as good (perhaps and older version) - I would go for the "PREMIUMS".
 

StorminMatt

Flashlight Enthusiast
Joined
Oct 30, 2012
Messages
2,263
Location
Norcal
Tenergy actually makes three D cells: the blue ones (10000mAH HSD), the Premium cells (10000mAH HSD), and the Centuras (8000mAH LSD).
 

N8N

Flashlight Enthusiast
Joined
Apr 26, 2013
Messages
1,246
I just picked up a pair of the D cells maybe a week ago as part of my push to get rid of all alkaline cells in my house. One thing you should know is that at least the ones I got came about 20-25% charged, not the 70-75% that I've come to expect from Eneloops. However, they appeared to have full capacity per the break-in cycle on my C9000, although they did not discharge at 0.2C but at 1A as that is the maximum discharge current of the C9000. I am actually only using one of the cells (my old Simpson meter takes a D-cell and a 9V battery) so I put the other one away and will try to remember to discharge it in a few months to give a report on its self-discharge rate, as I haven't seen a live test of it. Yes, I know, it's a sample size of one, but it's what I can do.

I noticed similar behavior on the C cells that I bought at the same time; low charge out of the package but they charged to over rated capacity. I also bought some 9V ones and they stayed on a Maha 9V charger for maybe an hour or so before I got a green light. (I obviously don't have a smart charger that will give me reported capacity for a 8.4V "9V" battery, because if one exists, I haven't seen it!) Assuming that I don't need to use the flashlight that the Cs are in over the next few months I'll discharge those as well.

In Tenergy's defense, the Centura is advertised as low self discharge but not as ready to use or precharged, so I'm hoping that this is normal, I won't be worried unless/until I test them again and get bad news.

The good news is that all of my meters (Simpson 260 Series 7M, Fluke 87, and some older Fluke as a backup) seemed to be OK with the Centura batteries - especially since two out of four (the D cell and one 9V) were either leaking or bulging, not what I like to see in my expensive equipment!

I have read that Accupower cells used to be good but now, not so much. I have no personal experience with them.

Edit: wow, looks like we're responding to a thread necro, but still, this topic is of interest to me so I assume that it may be of interest to others.
 

N8N

Flashlight Enthusiast
Joined
Apr 26, 2013
Messages
1,246
Well, this isn't promising... pulled out the one D cell (Tenergy Centura) that I wasn't using, marked "9/11/13 8067 mAh"

It's been discharging for about 30 minutes and already is at 1.11V...

I'll let you know how it's doing when it's discharged. I also can discharge two Cs that are in an unused flashlight, but it was switched on a few times (for a few seconds) to make sure it worked.

Edit: it's done... 7160 mAh. So apparently the low voltage (discharging at 1000 mA, the max of a C9000) didn't keep it from giving lots of energy.

7160/8067 = 88.8% capacity retained after one month of sitting.

I'll charge it back up and check in after another three months if I haven't used it...
 
Last edited:
Top