Originally Posted by Justmadeit:
“how do you know how long to charge for though it i get 2500 batteries for example ?? i was doing a 12 hr charge on the 1800 batteries i had”
If the charger clearly states "150mA" then you're not fully charging the 1800Ma/h cells you have already if you only charge them for 12 hours. NiMH cells are only around 66% efficient, so they need charging to 1.5 times their indicated capacity to be fully charged.
The time for a full charge will be the capacity divided by the charge current times 1.5, so...
In the case of a 150mA charger, you'd need to charge the 1800mA/h NiMH cells for 18 hours to fully charge them.
With the same charger and 2500mA/h cells, the charging period for a full charge will be 25 hours.
You could by a rapid charger but it
will reduce the number of charge/discharge cycles before the cells are fit for the bin unless it's an intelligent rapid charger. On the basis that good rapid chargers cost considerably more than a few sets of cells will cost you, the cheapest and most reliable (ie, long-lived) solution is just to have a few spare sets ready-charged from a conventional charger and cycle them around.
These are facts you can check for yourself by Googling reputable sources.