I have a B&D Firestorm 18v 1-hour battery charger, model 5100235-09 (240v). When I insert a battery to charge, only the green "battery full" LED lights immediately. But the battery never charges. Opening the charger revealed that the R2 resistor (looks like around 2 watt type, ie. not as big as a 5W rectangular type, but more than 3 times the size of a 1W cylindrical one) has overheated/scorched. I cannot make out the colour bands due to the discolouration, but the first band appears to be brown, second white, third grey?, fourth silver? Does anyone know what this resistor's correct value is supposed to be? Also, diode ZD2 appears to have conduction in both directions, whereas ZD1 does not. Does anyone know what type of diode ZD2 is? Rectifier diodes D1 - D5 all appear OK. Do you know what the T- and T+ connections are for? Does anyone have a circuit diagram for this board? I do not wish to purchase another B&D charger as I have been reading that they are !@#$. I would prefer to try to repair it or, preferably, adapt a DeWalt 18V charger to charge my slide-on batteries. Any ideas on how I can do this perhaps? Cheers

Hi I have same problem with the charger. Solution is to replace the charge with new part number issued from B&D Australia
Number of 90515050-01 until stock runs out , then it is replaced by part number of 90578873 early to mid june 2013.
Hope this helps
Lance from Perth , Western Australia.

I've the same problem with the charger. first the transformer keep overheating and burnt then only the red light will turn on even the battery is fully charged. The F188 cordless drill is one of the best drill B&D has ever made but let down by this poorly designed charger. The rest B&D are just S*#T!I don't have all the answers to your questions:
1. I removed the transformer and replaced it with a external switching mode 24VDC PS.2. R2 is measured around 38 ohms, the colour seems orange-white-black. it does have discolouration. a higher one or two in parallel may help.3. ZD2 is 2V4, and ZD1 is 6V2, that may explain why ZD2 is measured 1.88 V reverse voltage with my Fluke 189. I'll try to use a different value later.4. T- and T+ are for detecting whether the battery is inserted and battery case temperature, there is a tiny temp sensor built in the underneath the metal button, my one measured around 8.8k ohms connected or not. What's yours value?