i have Nitecore i4 and i don't find this a problem. why complicate things? just plug another battery together with the other one. hindi naman kailangan na 2 sila na fully drained. and i don't think 1pc lang ang rechargeable battery nyo sa bahay. like me, i have 8 pcs AA and 8 pcs AAA eneloop batteries which i don't use all at the same time. dapat may spare kayo.
why complicate things? get a better charger! LOL
those chargers have never been top-notch so no need to keep justifying their shortcomings
also the trickle charge issue is only for the 2014 version. you have the older version right?