jj604's blog View Details
Posted by jj604 | Apr 08, 2016 @ 06:45 AM | 2,746 Views
Big thanks to Jim from Banggood who sent me an Eachine Gemini 2100 battery charger for review.


This charger is also sold under the Venom brand with slightly different cosmetics.


See picture 2

I normally only review stuff I have bought but this was a potentially attractive charger and I was interested to see how good it was. Most of my charging is done with higher powered units with separate power supplies but an AC charger is handy for those occasions when you donít want all the hassle and size of the larger unit. A while back, I bought a Hitec X1 (made by SkyRC) just for the convenience and use it a lot, particularly for smaller packs.

There are plenty of dual and even quad chargers around that can charge two or 4 totally different packs at one time, and there are plenty of AC chargers around that do a single pack but there are not many that combine AC input and dual charging and decent power. The obvious one that comes to mind is the Graupner Polaron AC/DC Sports 240W made by SJ Electronics. The Polaron is a very nicely thought out quality charger with a unique vertical form factor, excellent color touch screen and menu system and dual 120W chargers when used with a separate DC supply. It drops to a total of 120Watt on AC however with that power shared over the two channels. The most powerful dual AC/DC charger I have found is the Ultrapower...Continue Reading
Posted by jj604 | Jan 18, 2012 @ 12:28 AM | 2,568 Views
I started a thread here describing my measurements of LiPo cell IR on some common packs as the temperature varies from 50˚C down to around -20˚C.