maxlithium 9v Rechargeable Batteries, Lithium-ion 9 Volt Battery Capacity 800mAh 7200mWh,3 Pack with Quick Charger

Since I wrote my original review, I've added a sixth battery of this type (9V Lithium ion rechargeable) to the series I've tested using calibrated lab equipment. The new one, Exmate, has the highest measured life (840 mAh, even above its advertised 800, a rarity). At $4 apiece, it is the best value not only for a true 800 mAh battery, but cheaper than most of the lower capacity ones as well. This Exmate brand replaces the Energitech as the best value I've found in terms of cost per mAh (.48 cents/mAh), and replaces the MaxLithium as the highest capacity, all as tested up to 1-16-22. I previously tested 5 brands of Li-ion rechargeable 9V batteries using calibrated test equipment. Back then, the Energitch brand battery ranked #3 in runtime and #1 in value. The measured capacity (think runtime) was 510 mAh (vs. claimed capacity of 600 mAh) and cost $2.25 but now is $4.50. The longest run time was MaxLithium (750 mAh) and cost $5.60. The best value (mAh per $) back then was Energitch (510 mAh) at $2.25. For comparison, a new Amazon Basic non-rechargeable alkaline battery had a capacity of 490 mAh and cost $1.31. (For the other brand reviews, click on my name.) Notes on testing: I selected the highest capacity and lowest price batteries I could find, and then added a range in the middle. Testing protocol and notes: all batteries were fully charged on the same Li-ion charger, run on constant-current load (50 mA), and discharged to end voltage of 6.0 VDC. The mAh value is the product of the discharge current and the time before the voltage drops to 6.0 V, measured once per second and averaged. You can calculate approximate runtimes in hours for other currents by dividing mAh by current in mA. I also measured energy capacity in Wh, which tracks mAh closely because most Li-ion batteries have similar discharge curves. This brand measured 3.73 Wh and cost 0.44 cents per mAh capacity. I have no interest of any kind in any of these companies and paid the rate advertised on Amazon at the time of purchase. Testing is based on my professional knowledge and experience using calibrated lab equipment.

I started switching to rechargeable 9Vs in my guitar pedals (and using external battery/DC adapters for mini pedals that don't support batteries) when rechargeable 9Vs hit the 600mAh mark. They finally lasted long enough, were portable (now only the amp needed a power feed, so pedals could be placed anywhere), and avoided all 50/60Hz hum issues without paying $200+ for a fancy isolating/filtering power brick. Granted, I have a relatively simple setup, with only 4-5 dedicated overdrive pedals, and a small multi-effects system to handle all other effects (BOSS GT-1) -- so batteries are more viable in this scenario than, say, a pedal board with a dozen or more pedals. But for simpler setups like this, it works perfectly, so long as you're disciplined in always keeping your batteries properly charged. Now with these 800mAh rechargeable 9Vs, they last even longer, work better with fancier/more power-hungry pedals, and charge much faster. My previous charger that came with my old 600mAh rechargeable 9Vs took over six hours to charge from completely dead, while these only take a couple hours. Plus, the charger is less than half the size of the old one, making it more portable to throw in a bag or even a coat pocket. And these are the only rechargeable 9Vs I've found that go up to 8.7V. I test my batteries with a full voltmeter (not just a good/bad indicator), and two of the three batteries that came with the charger usually hit 8.71V, while the third one usually stops at 8.64 (which is still better than any other rechargeable 9V I've used). I can't speak for the accuracy of the 800mAh claim, but I can say that they definitely last longer than my 600mAh rechargeable 9Vs ever did.

The batteries charged quickly. They last much longer than the NiMH batteries that they replaced. They are just slightly larger than standard 9 volt batteries and might be a squeeze in some battery compartments. They were fine for me in a Audio Technica wireless mic. I cannot report yet on their life.

i did a discharge capacity test on all 3 pcs at an abnormally high current of 0.550A rate. this is FAR more than would be normal for a 9V. the batteries had no trouble doing this. so they should easily handle a normal 9V load. they are rated at 800 mAh. i got 820, 750, 780 on my three, but this was at 0.550A, so at a lower rate they would give bigger numbers! so i'd say they are very good batteries that meet their rating with no sweat. the charger works well, charges rapidly, and everything seems good quality. the box they come in is good for storage and also of good design. when the batteries are drained, the internal cut off circuit works well. i would not use these in a fire alarm, cuz they usually beep with a weak battery and this battery may be fully discharged and shut off, so u would get no warning beeps maybe.

Works great Hold the charge for a long time. Saves me a lot of money on 9v batteries and also helps the Environment, a win, win situation.

Just received these and charged them up. Ready for use and not had to use yet so battery life and logevity are quess ratngs. Was pretty happy with what little time it took to charge the batteries up in charger.

I thought a wall plug in would be included but wasn’t. It was overall ok because my extension power strip has a couple usb ports so I charge it there. I use a tens unit for pain , so go through a lot of disposable batteries. Prices keep going up on batteries so getting a rechargeable battery system made more sense and has saved me a lot of money so far. Each charge lasts a long time , so much more than disposable batteries. So far so good, glad I made this purchase.

These are the BEST rechargeable batteries I have had!!!!! I can NOT praise them enough.

Lo he usado poco pero bueno gran articulo

Funziona bene

They looked very high quality in there presentation box. They charged up to 8.99 volts, no load. So time will tell how they are.

Carga rapida

I bought it for my Tens machine, kept me many hours to use it after first charging. Definitely Recommend