There are basically three types of chargers to choose from Trickle Chargers, Timed Cut off Chargers and the Intelligent Microprocessor Type.

Trickle chargers charge at a very low rate and can take 14 hrs to fully charge batteries, these are gentler on the battery – you are less likely to overcharge the batteries and should get more cycles from the batteries. Timed Chargers – Usually between 3-8 hours depending on Battery Type. These charge at a higher current and charge for a pre-determined period of time. You can run the risk of overcharging by say charging up batteries that have only been previously partially discharged. Doing this too often leads to shortened life and performance. These are a less expensive that the Intelligent Chargers and providing they are used with more care then they are perfectly adequate. Intelligent Microprocessor Controlled Chargers are the latest developments – they are able to charge at much higher currents – therefore bringing the time to recharge down to 1-2 hours. They have clever electronics that are able to sense the amount of charge required to top up the battery and then they move into trickle charge.

Like everything in life you get what you pay for and the choice depends on your budget. I hope that this short passage helps you make a more informed choice.