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Ipower 9V 520mAh Protected Lithium Ion (Li-ion) Snap Connector Battery - Bulk (PRO-IPOWERUS-9V-520)

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Ipower 9-Volt

Rechargeable Lithium Polymer 9V battery 520mAh

iPower is offering the first and only Ultra High Capacity lithium polymer rechargeable battery intended for professional use. Lithium Polymer batteries use a new gel-type electrolyte. This gel has an energy density that is 20% more than typical Lithium Ion batteries and approximately 3 times better than NiCad or NiMh. These batteries are geared toward the location sound person using professional wireless and will out perform any rechargeable battery currently available for this use.

Actual Capacity is very close to that of a standard 9V Alkaline Battery (540mAh). The new smaller size fits just about any device and it will actually out perform a standard 9 volt alkaline battery in High Drain Applications.

Features and Specifications:
  • Chargeable in the NEW iPowerUS Charger ONLY.
  • More capacity than any other 9V Rechargeable Batteries available.
  • This 9V rechargeable battery will operate equipment much longer than other rechargeable batteries.
  • Great for wireless microphones, and other equipment that use 9V batteries etc...
  • Can be used as a exact replacement for standard 9 Volt batteries in most equipment
  • Can be recharged hundreds of times, and the Lithium Polymer 9V Rechargeable battery has no memory effect.
  • Special design with Li-Polymer cell, capacity up to 520mAh
  • Lithium-Polymer material, Working voltage 8.4V~6.5V,
  • Standard output current 1~80mA, Hi-rate continue output 500mA/hour, Max. transient current up to 2500mA/sec.
  • Nominal Voltage(V): 8.4V, Discharge Cut-off Voltage: 6.4V
  • Built-in Protection IC to control over-current discharge and under-voltage discharge.

Frequently Asked Questions:

What is the difference between the consumer 9V-500 and the Pro 9V-520?

The pro 520 contains the best grade/high spec raw materials, with special control electronics, yielding higher capacity and reliability. The 520 is enhanced to power digital systems with switching power supplies. The 520 will be able to handle current spikes,heavy supply filters, shorts and other high current and adverse load conditions, with a lower rate of failure and an average overall product capacity increase of 10%, day in, and day out.

What is the operating voltage for iPower batteries.

iPower LiPo batteries fully charged, will vary from 8.0 to 8.4 volts. Most batteries will charge to 8.2 or 8.3 volts. The batteries will deliver 80% of its power by 7.2 volts.

Revision Ver.05 (Feb. 2008) Note
Nominal capacity (Discharging Current 50mA, 0.1C) 520mAH  
Min. capacity (Discharging Current 50mA, 0.1C) 470mAH  
Nominal voltage 8.4V~6.5V (+0.0V/-0.2V)  Std. 9V~6V
Discharge End Voltage 6.5V (+0.2V/-0.4V) By different rate
Charging Model (With iPowerUS DC-9V Fast Smart Charger) CC & CV  
Charging Current (With iPowerUS DC-9VFast Smart Charger) 150mA~500mA  
Charging Voltage 8.4 0.05V  
Nominal Discharging Current Up to 500mA (1C)  
High Rate Discharging Current Up to 750mA  
Max. Discharging Current Up to 1500mA, 5 sec. May be short life
Over Current Protect 1.50~2.5A  
Over Voltage Protect 8.50V 0.05V  
Low Voltage Protect 6.5V +0.2V/-0.4V)  
Internal Resistance ≤ 450mΩ  
Storage Temperature (centigrade degree) 0~40°C  
Charge Temperature (centigrade degree) 0~40°C  
Std. Discharge Temperature (centigrade degree) -10~45°C  
Low Temperature Discharge (-20~-10 centigrade degree) >65%(>325mAh)  
Std. Charge / Discharge Cycle Life (100 times / 3 month) >65% (>325mAh)  
Size 47.5* 25.5* 16.4mm  
Weight 27.5g 0.5g  
3 months limited warranty for DC9V-500mAh Li-Polymer Battery
High Rate Charge & Discharging (over 750mAh) and High Temperature (over 45 centigrade degree) should be losing cycle life.
Li-Polymer physical reaction & chemical reaction limit value: Li-Polymer damage test (without Protection): electro-chemistry reaction (after fully charge) maximum of greatest output current 4~5CmA (2000~2500mA), and maximum of greatest output Voltage 8.4V~5.6V.

lithium-ion safety warning
Battery Size:9V
Battery Capacity (mAh):520
Battery Chemistry:Li-Poly
Battery Voltage:9
Battery Terminal Type:Snap Connector
Battery Shelf Life:10 Years
Packaging:Contractor Pack
Warranty:Battery Junction 30-Day Warranty
Return Policy:Battery Junction Return Policy
Country of Origin:China
Associated Battery Sizes:1604A, 1604D, 1604LC, 6AM6, 6F22, 6LR61, 6LR61XWA, 9V, A1604, AL-9V, E522, EN22, K9V, LA522, MN1604, PC1604, PP3, U9VL
11 Reviews
82% (9)
9% (1)
0% (0)
0% (0)
9% (1)
By Ron
Great Results even after 3 Years!
May 15, 2016
I cannot say enough good about these batteries. They continue to preform at peak power and efficiency even after 3 years of steady use. I first bought two batteries just to try out and because I was so impressed, that in two weeks time, I bought two more. These batteries have served one purpose only and that is to power my Headroom Portable Headphone Amp.. The reason I use this amp. even at home, is because I am driving a AKG K701 headphone and it requires a little more Oomph! then my iPod and iPhone can give to produce the quality of music that I enjoy. When I first started using these batteries, I compared them to a couple of different top of the drawer Alkaline batteries. No, I am not going to tell you that these batteries lasted longer than the Alkaline batteries but they were not too far behind the Alkaline batteries in longevity. I do not remember the exact figures because this was three years ago but rather than lie, I will just say there was not enough of a difference to be concerned about. These batteries and charger have more than paid for themselves. I would also say that probably now, I am using these batteries for free, its like icing on a cake. Sure I can also plug my amp into a wall outlet and save wear and tear on these batteries but it is much more convenient to be able to just pick up my amp and charger combo and go where ever I please without missing a beat.
  • Lots of power, great power curve when comparing to Alkaline batteries, fast charge, about +/- 2 hours, alkaline drop off in power slowly so I have to keep adjusting the volume, while iPower batteries put out enough
  • power to run the k701's and then drop off sharply. I do not have to adjust the volume to keep the sound level. Though the initial price is a little high, these batteries have definitely payed for themselves
  • Inital high price for both batteries and charger, but in the long run, it will save you money.
By Hal H.
Solid choice for short-term wireless mic use
September 22, 2015
We use these at our church in our wireless mic setups. These batteries save us a bunch over the years as we keep a few fully charged and if something goes wrong, we can swap and recharge as needed. The batteries recharge relatively fast, so a few batteries could support a small presentation team fairly easily.

Our first set lasted 4 years of light use (got left in a wireless pack and swelled due to discharge) and we rarely bought alkaline batteries during that time. The only reason I have to give them 4 stars is that they are typical rechargeable batteries. These are not 9V; they are "9V" batteries. The fully charged voltage is around 8.5 volts. Now these have a normal discharge curve for lithium batteries, but they start lower than alkaline batteries. This causes our wireless mics to register them as used batteries, so it is hard to gauge how much remains. A few spares ready to go can stave off disaster, but the wireless mics will have little warning before dropping below the "empty" voltage range.
  • --Good capacity. The 520 Ah is comparable to regular Alkaline batteries.
  • --Long-lasting (if light duty)
  • --Good recharge times. Ready to go in the time it takes to discharge. Can swap and go.
  • --Not true 9V. Design makes these ~8.5, instead of the desired voltage. Can cause electronics to read "low bat".
  • --Can swell if they are over-discharged, deforming the battery.
By Gbob
NYC area
Good and Powerful
June 20, 2015
I like to use rechargeable batteries as much as possible. When I bought some new battery water timers, they required a 9V battery. I had an old 9V rechargeable, but the timer wouldn't work. So, I bought these, as they had a higher output.

They worked like a charm. So, now after the season ends, I can take them out for the winter and charge them again for another season. Less waste is good.
  • More power than other 9volt rechargeables
  • None yet
By Robert H.
Nashville TN, Omaha NE, Louisville KY
Hands down....the BEST rechargeable 9 volt!
January 15, 2015
I had two of these batteries. I am the lead singer in a very busy band, and I use 9 volts in my headphone monitor. Well, when one of our members left the band, he gave me one of these 9 volts. We do over 100 shows per year, and about 3 1/2 hours per night. I left one battery at a show accidentally, and the other one finally stopped working after almost 7 years of constant use! One battery lasts the full night. Very reliable and quick to charge! Also, my best buddy is a doctor in Phoenix AZ, and his clinic swears by these rechargeables that I told him to try.
  • Reliable, very cost efficient, and long life.I never worried about batteries and saved tons of money on 9 volts. I tried energizer 9 volt rechargeable and it was horrible. These are by far the BEST!
  • None
By John
San Francisco
These batteries are great for wireless microphones
January 11, 2015
This is the second set of these batteries I got for the sound system at church. The first batch lasted several years. The 520 Mah capacity is perfect. I'm seeing some others on the market with 700+ which I might consider for tougher requirements.
  • Longevity of charge
  • Special charger required

Ipower 9V 520mAh Protected Lithium Ion (Li-ion) Snap Connector Battery - Bulk (PRO-IPOWERUS-9V-520)

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