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Li ion can’t absorb over-charge and doesn’t get trickle charge when full. It’s not necessary to eliminate Li-ion from the chargernonetheless, if not used for a week or longer, it’s ideal to set the package in a cool location and recharge before use.

Types of Chargers

The most elementary charger has been the overnight charger, also called a slow charger. This goes back to the older nickel-cadmium times where a simple charger employed a fixed charge of approximately 0.1C (one-tenth of their rated capacity) provided that the battery has been connected. Slow chargers don’t have any full-charge detection; the fee stays engaged and a complete charge of an empty battery takes 14–16 hours. Because of its reduced capacity to absorb over-charge, NiMH shouldn’t be billed on a slow charger. Low-cost consumer chargers charging AAA, AA and C cells frequently deploy this cost system, so do some children’s toys.

The rapid charger drops between the slow and fast charger and can be used in consumer products. The charge time of an empty package is 3–6 hours. Most rapid chargers include temperature sensing to safely control a faulty battery.

The quick charger offers several benefits and the obvious one is shorter charge times. In a rate of 1C, (see BU-402:What’s C-rate?) Which a quick charger typically uses, an empty NiCd and NiMH charges in a bit more than an hour. As the battery approaches full charge, some nickel-based chargers decrease the present to adjust to the reduced charge approval. The fully charged battery switches the charger to trickle charge, also called maintenance charge. The majority of today’s nickel-based chargers have a diminished trickle charge to also accommodate NiMH.

In 1C, the battery charges to 70 percent state-of-charge (SoC) in under an hour; the excess time is dedicated to the saturation charge. Li-ion does not need the saturation charge as lead acid does; actually it’s better to not completely charge Li-ion — the batteries will last longer but the runtime will be a bit less. Of chargers, Li-ion is the easiest. No trickery applies that claims to increase battery performance as is often maintained by manufacturers of chargers for lead- and nickel-based batteries. Just the basic CC/CV method works.