A past selling the 4 led version. Inside of this two serial Li-po cells provided the output voltage - of course some below 9V. Now, the 3 led version contains only one cell with boost converter. Below more detailed this. The upconverter provide continuous 9V - independent the internal battery voltage. This good news-bad news situation, because the internal step-up converter superpones some noise the output voltage. The another thing : the converter has a quiescent current : is approx 60uA (0.06mA).See the photos. That this means to the fully charged battery is storage, after 3 month the available capacity approx drop 50%. The internal battery is a 3.7V 800mAh. This real capacity, but remember : this is meaning to 3.7V! But many capacity in the output 9v ? Well connect the EV-650 pack charger/discharger (similar to Imax B6) and run to discharge test /see photos. Well in the drawn capacity of 9V is 289 mAh. Remember : the 800mAh real, but means to the internal battery voltage.

A past selling the 4 led version. Inside of this two serial Li-po cells provided the output voltage - of course some below 9V. Now, the 3 led version contains only one cell with boost converter. Below more detailed this. The upconverter provide continuous 9V - independent the internal battery voltage. This good news-bad news situation, because the internal step-up converter superpones some noise the output voltage. The another thing : the converter has a quiescent current : is approx 60uA (0.06mA).See the photos. That this means to the fully charged battery is storage, after 3 month the available capacity approx drop 50%. The internal battery is a 3.7V 800mAh. This real capacity, but remember : this is meaning to 3.7V! But many capacity in the output 9v ? Well connect the EV-650 pack charger/discharger (similar to Imax B6) and run to discharge test /see photos. Well in the drawn capacity of 9V is 289 mAh. Remember : the 800mAh real, but means to the internal battery voltage.

A past selling the 4 led version. Inside of this two serial Li-po cells provided the output voltage - of course some below 9V. Now, the 3 led version contains only one cell with boost converter. Below more detailed this. The upconverter provide continuous 9V - independent the internal battery voltage. This good news-bad news situation, because the internal step-up converter superpones some noise the output voltage. The another thing : the converter has a quiescent current : is approx 60uA (0.06mA).See the photos. That this means to the fully charged battery is storage, after 3 month the available capacity approx drop 50%. The internal battery is a 3.7V 800mAh. This real capacity, but remember : this is meaning to 3.7V! But many capacity in the output 9v ? Well connect the EV-650 pack charger/discharger (similar to Imax B6) and run to discharge test /see photos. Well in the drawn capacity of 9V is 289 mAh. Remember : the 800mAh real, but means to the internal battery voltage.

Inside exactly same as sku 986563, only with different sticker... Very good and usefull battery. There are two 420mAh cells in series, so nominal voltage is 7.4V and capacity is about 400mAh (measured it with 100mA load). NOT 800mAh at 9V as description says. When fully charged voltage is about 8.3V, when fully discharged voltage is about 6V. There is battery protection, so you can't overcharge or overdischarge batteries. When is voltage about 7V there is not much energy left and battery will discharge very quickly. Will not work with all devices, because something really needs 9V. But if your device works fine with 7-8V this battery is good replacement. You don't need spend more money for non-rechargable batteries. You don't need special charger, just regular micro USB with 5V. There are 4 LED which show you how much charged your battery is. When you charging it, battery indicator is not good, because after one hour all 4 LED are lit, so you think is charged, but not. Charging time is almost 4hours. Good battery, recommended!

Inside exactly same as sku 986563, only with different sticker... Very good and usefull battery. There are two 420mAh cells in series, so nominal voltage is 7.4V and capacity is about 400mAh (measured it with 100mA load). NOT 800mAh at 9V as description says. When fully charged voltage is about 8.3V, when fully discharged voltage is about 6V. There is battery protection, so you can't overcharge or overdischarge batteries. When is voltage about 7V there is not much energy left and battery will discharge very quickly. Will not work with all devices, because something really needs 9V. But if your device works fine with 7-8V this battery is good replacement. You don't need spend more money for non-rechargable batteries. You don't need special charger, just regular micro USB with 5V. There are 4 LED which show you how much charged your battery is. When you charging it, battery indicator is not good, because after one hour all 4 LED are lit, so you think is charged, but not. Charging time is almost 4hours. Good battery, recommended!

Inside exactly same as sku 986563, only with different sticker... Very good and usefull battery. There are two 420mAh cells in series, so nominal voltage is 7.4V and capacity is about 400mAh (measured it with 100mA load). NOT 800mAh at 9V as description says. When fully charged voltage is about 8.3V, when fully discharged voltage is about 6V. There is battery protection, so you can't overcharge or overdischarge batteries. When is voltage about 7V there is not much energy left and battery will discharge very quickly. Will not work with all devices, because something really needs 9V. But if your device works fine with 7-8V this battery is good replacement. You don't need spend more money for non-rechargable batteries. You don't need special charger, just regular micro USB with 5V. There are 4 LED which show you how much charged your battery is. When you charging it, battery indicator is not good, because after one hour all 4 LED are lit, so you think is charged, but not. Charging time is almost 4hours. Good battery, recommended!