Actually, Don, there is a 4.8V battery from 5 Volt NIMH 600mAh Battery for The Meglodon
Thank you, cappadoc! That is how I am learning these days: shoot my mouth off and then have someone wiser correct me.
Although this 600 mAh battery doesn't help the OP (who wants more than 900 mAh), that is fascinating! And I see that it has been around for awhile. Upon searching for it on Google, I came across a year-old thread in the forum which must not be named (or linked) that discusses this battery (or the 400 mAh version of it). Not much talk about it here on ECF.*
* And why is that? 5V vaping used to be the rage. For example, why is the Prodigy V3 6V (when the first two versions were 5V regulated)? Is it the availability of LR and HV attys? [That is, adjust your desired watts by using LR on 3.7V or HV on 6V. Is this better from an electronics perspective than regulating the voltage?] Or is it the emergence of variable voltage? [That is, why be stuck with 3.7 or 5 or 6, when 4.3 or 5.2 gives you the perfect vape for a given atty and e-liquid.]
How
safe is
NiMN (Nickle Magnesium) chemistry? I know about
LiMN (Lithium Magnesium).