Hi from hilly Sheffield

D

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AS far as I can see from your photos, the cells are in blocks of three with their plus and minus terminals on opposite sides. You can test that by working your way up the two cell packs with your voltmeter to get 10 readings between 3.6v and 4.2v.

Starting with the highest ones, you connect it directly across the terminals and let it do its work. You must monitor it carefully with a voltmeter because it will drain the cell all the way to zero if you let it, which will destroy the cell. Be aware that the fall will accelerate once it goes past 3.7v.

Depending what resistor you got, it should drain at about 1 amp, so to go from 4.2v to 3.8v (about 2/3 of the capacity) should take about 6 hours for a 10aH battery, 10 hours for a 15 aH one, etc. Don't forget about it or you'll be looking for a new battery. Monitor the first one carefully, then program some suitable alarm reminders into your phone, so that you don't have to watch so closely.