I use a lot of these. They fit really well in a lot of rockets... they'll even fit in an 18mm body tube (well, almost...)I use the 300mah nano-tech. They also fit perfectly on the eggfinder mini nosecone sleds available from CI(VII)
You probably can, but it's better to get something that allows you to adjust the current and allows you to monitor the voltages. I have a Turnigy P606, they're about $35 from HK, it will handle 1S-6S cells and you can charge multiple batteries of the same type simultaneously, up to 6S (i.e. three 2S 350 mAH batteries). It's also AC/DC, a big plus if you want to top off your batteries in the field. https://hobbyking.com/en_us/pd606-charger-us-plug.html
I have an earlier version of this one: https://hobbyking.com/en_us/imax-b6ac-v2-professional-balance-charger-discharger.html?___store=en_us and really like it.That charger is on backorder, darn. I feel overwhelmed looking at chargers. My head hurts.
I also use the Imax B6 charger, seems to work well and has every feature you could want. Looks like Hobbyking has a better price than I paid on Amazon but be careful if the price is too low, apparently there are a lot of cheap knockoffs that don't work or won't last.
Do you know how much power is drawn when an Openlogger is attached to an Eggfinder. I've done a couple of test and it appears the logger draws more juice (which makes sense since data is being continuously written to SD card).An Eggfinder TX draws about 70 mA on average, so a 350 mAH battery should last about 5 hours.
I don't have one to measure but I would guess it would be mouse-power compared to the EggFinder telemetry transmitter. Would be nice if you can get some measurements.Do you know how much power is drawn when an Openlogger is attached to an Eggfinder.