8 pcs of Premium D Size 10,000mAh High Capacity High Rate NiMH Rechargeable Batteries - UL Certified

I have used the 8 pcs of Premium Tenergy D Size 10,000mAh High Capacity High Rate NiMH Rechargeable Batteries for over a year, and have been pleased. I have seen this brand used on TV and movie sets, and already know the quality - this is a best-in-class item. Around the house I use them for the lovely, but energy hog "Luminara" flameless candles - which are also best-in-class ( and used at theme parts, movies, TV and Broadway). After a year++ of use, I can assure you that that the product is well worth your consideration. To be fair, they are costly, but in this case, you DO get what you pay for - excellent results! You will need to get a premium charger, but will be glad you made the investment. During the holiday season, I needed/wanted to include D battery packs for several gifts. Suggesting re-chargables can be a tough sell for some. They wanted the regular battery set up. Ugh! I easily spent around $8.50 per 4-pack, and freaked-out when I needed one more and bought a pack of regular battries at a quick shop store (think "numbers" LOL) and paid close to $12.00. Just do the math here. Bottom line: * The product is heavy, but are REAL D cell/s unlilke other brands which encase AA's to create the D shape .. * It is a brand studio's use, it is a professional item. * Will save you money over a short period of time. * You can use them over-and-over. * Outstanding quality, and a trusted brand. Get the good ones here, you will NOT be sorry. Over time, it can be kind of fun to quantify your savings, too. I can ASSURE you that studio's do!

EVERYONE NEEDS TO READ THIS (SOLUTION TO ERRORS AND LONGEVITY) who has troubles believing these batteries are bad (won’t change showing an error or null). I have many “SMART or INTELLIGENT” chargers (controlled by advanced auto sensing circuits) and IF the battery is drained below a certain point or depleted, sometimes these batteries show an error or simply are not recognized because the intelligence can’t detect a fully dead battery or below a certain voltage. IF YOU USE A CHARGER WITHOUT THE FULL AUTO SENSING “intelligent” CIRCUITRY, IT WILL CHARGE. I have placed these “supposedly malfunctioning” batteries in a MORE MANUAL CHARGER THAT IS NOT SO SMART (just auto-off) for 10–15 minutes (enough to infuse a certain charge or polarity, then place them back into you smart charger… bingo. THEY ARE RECOGNIZED & CHARGES 100% or the time. Or just leave them in there until charged. I have used this solution for many years and it works 100% of the time on battery that seem to have errors / unrecognized with intelligent chargers, many hundreds of times. These older more manual chargers just begin charging when you place a battery in them, it doesn’t look for status, battery voltage or battery type at all, it just sends a charge, then shuts off when it reaches a certain voltage. Buy one of the “dumbest” or “least intelligent” UNIVERSAL chargers you can find and THIS WILL WORK WITH ALL batteries you thought were defective. I have 3 old model Rayovac PS3 Universal chargers and THESE WILL CHARGE ANY BATTERY THAT AN INTELLIGENT CHARGER HAS AN ISSUE RECOGNIZING (or will get it started). I have at least 7 newer smart chargers (especially those with bar meter displays) and THEY ALL have various issues one time or another with some depleted batteries, but not these older chargers. ISSUE OF NOT LASTING LONG: Also I have noticed that all my intelligent chargers tend not to fully charge a battery, as these less intelligent chargers will. Batteries charged in a modern intelligent charger just never seem to last as long. But when charged in a more manual non-sensing charger (ie. no bar / voltage display) just with auto off, they last so much longer because they are charged more fully. I have experienced this for many years. In fact, I can take ANY battery that is “fully charged” in a newer intelligent charger with a bar meter that claims to be fully charged, place it in the more manual universal charger; and it will continue charging for a few more hours (Cs or Ds), indicating that it isn’t really fully charged to capacity. This is also the case for AA’s as well, but obviously shorter extra charging times. If I recharge those batteries BEFORE getting too depleted, they are recognized, w/o the error indicator. You don’t have to believe me, but you will be a believer if you get your hands on an older or simple auto-off universal charger, it will be an awakening and you will be a believer then. (and don’t argue the merits of intelligent charging over simple chargers - that’s not the point here). THIS IS TO GET YOU PAST THE ERROR STAGE AND CONTINUE USING BATTERIES YOU THOUGHT WERE DEFECTIVE - AND RESURRECTS THE MONEY YOU THOUGHT YOU WASTED ON DEFECTS & ERRORS.

[Capacity:] Tenergy seems to have world wide the highest rated capacities for rechargeable NI-MH batteries. Looks like Tenergy has almost maxed out of whats technically possible. No other maker has these capacity range, hats off !! Even the best Japanese makers have max roughly only 60% capacity (5700 mah), again respect for this !! It's awesome how much capacity this rechargeable batteries have. [Weight:] Lets face it, batteries are heavy. Capacity limits and weight are probably their worst obstacles. Fortunately the extended capacity plays as advantage as you might come by with one battery pack where you used two or more in the past. This comes in VERY handy when either every gram counts or stamina is everything. [Charging:] We all know that increased capacity not only gives you better mileage but also requires fewer (but long) charging cycles. Generally speaking high capacity is a good thing but long charging times might be a turn off when you are in hurry. In addition quick charging or charging to often (to early) might decrease life cycle of the battery (read: damage it). So it makes sense that you also invest in an "intelligent" charger, that checks the battery status, de-charges it controlled and recharges it gently. This way your investment is protected. [Usage:] So far I have used those batteries and haven't realized any significant drop of capacity. Its to early to tell the long term quality of the product, however so far everything is indicating a good quality product. I will update this section in regular intervals to indicate any capacity changes. ---[Summary and target user:]--- I am conservative. For the technology and capacity alone I would easily give 5 or even 6 Stars. I understand that 10.000mah is a capacity that is almost unheard off and more likely bikes or even small car batteries have it. For the average user even 50$ + charger cost is a deep price to pay, so its not a deal for occasional uses. HOWEVER, for power sucking heavy usage this is a steal, especially if you MUST HAVE the extended stamina. 5 Stars for heavy users 4 Stars for average users ((Reason is initial cost) Enjoy the ride !!

This is a must have, for the MAG LITE ( D cell ), along with the LED LAMP converstion, the batteries last a good bit, before recharging

I use them in an electronic cat door, and they outlast regular batteries before needing re-charge. This is great because changing the batteries in this door is a pain. The product is exactly as described. I expect they will easily pay for themselves plus reducing waste/garbage.

Great

last longer than the rest will order more