Li-ion batteries arent as susceptible to the "memory" issues like the older Ni-Mh or NiCd batteries. And it's not that the batteries have a memory setting, its a term used to describe a chemical effect on some types of rechargeable batteries. For instance if you keep recharging a NiCd battery after it naturally loses 20% from just sitting there, eventually you'll only have 20% of usuable energy in that battery because it wont go any lower than 20% discharge when you use it. Hence those types of batteries require a full discharge/recharge every so often to maintain full use of the battery.
Again, that's not an issue for Li-Ion batters. In addition to that, its also not recommended to fully discharge Li-Ion batteries; the lesser the discharge, the longer they last. So you'll actually be hurting these batteries if you fully discharge/recharge them once a month. They also have a relatively slow discharge rate, so for the OP's use i'd recommend putting them on the charger every few months.
How often do you change your oil... twice a year? If so, id throw them on the charger while you're doing your oil change and call it good.
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