Bro you would get the answer at http://forums.benheck.com/viewtopic.php?p=272329
You put it in the charger when it is dead or near dead and allow it to charge for two hours.
It depends on how many mah your charger can produce
Yes, your charger should be able to charge AAA 1800mAh batteries. It is common for battery chargers to be able to charge multiple capacities of batteries as long as they are compatible with the chemistry (e.g. NiMH, NiCd) and size (AA, AAA). Just make sure to follow the manufacturer's instructions for optimal performance and safety.
Short answer: UR18650Y Complete answer: Sony Energytec 18650GR cells are common, and are 1800mAh @ 3.7v So you're looking for a 18650 sized battery that holds about 1800mAh. (All 18650's from any manufacturer will be 3.7v and the same physical size.) This chart: http://www.sanyo.co.jp/energy/english/product/lithiumion_2.html Shows that the UR18650Y is a drop-in replacement. Best of luck, and if you're soldering them into a pack *BE CAREFUL*.
This can depend on the charger and the battery. I'll go off what most people i know use commonly. If you have a fast charger and a 1800mAh 7.2V battery, then it should take a little over an hour. Obviously bigger mAh batteries take longer to charge as they last longer.
For brusshles - about 20 mins For brusshed - about 15 mins This does depend on the quality of a battery, and if you going full throttle or not (The times above are for half throttle, and a medium quality battery.) a quality battery is usually heavy (around 400 - 450 grams) so, with a quality battery: For brusshles - about 25 For brusshed - about 20 (I recomend 4200mAh, runs for about 1hr on full throttle) :) - rc car dude -
This is a measure of battery capacity. It relates to how long a battery can produce a certain amount of current. For example, a fully charged 1500 mAh battery can provide 100mA for 15 hours (or 50 mA for 30 hours or 200 mA for 7.5 hours, etc.) The battery rating is the capacity for a new battery. After many charge/discharge cycles, you will start to see a reduced capacity.Related note: The capacity of a battery doesn't relate to the maximum current you can draw from the battery - that depends on several factors including the type of battery, its size and construction. For example you might be able to safely draw 15 Amps from a hobby style 1500 mAh Lipo (Lithium Polymer), but don't try to get 15 Amps out of 1500 mAh AA Nicads.
I read that the initial charge should be 4 hours, but no longer, and that all charges after that should be 2-3 hours, but again, no longer. Charging too long will cause the battery to not be able to hold a charge and could even cause it to leak.