lancslad Posted January 19, 2007 Report Share Posted January 19, 2007 ok i have a deben lamp one of these can anyone recommend a replacement battery that will give me much longer use than the original deben battery please Quote Link to comment Share on other sites More sharing options...
pin Posted January 19, 2007 Report Share Posted January 19, 2007 Any gel cell battery which is 12v and has a greater capacity than 3ah. Quote Link to comment Share on other sites More sharing options...
lancslad Posted January 19, 2007 Author Report Share Posted January 19, 2007 Any gel cell battery which is 12v and has a greater capacity than 3ah. so would a 12v 7.2Ah or even a 12v 12.0Ah from here give me double or more lamping time mate ? Quote Link to comment Share on other sites More sharing options...
pin Posted January 19, 2007 Report Share Posted January 19, 2007 In theory yes, however due to the way you will use the battery you need a "deep cycle" battery. Known as leisure batteries sometimes, they are designed to be discharged almost completely as part of their job. Normal lead acid cells are not meant for this kind of use and won't last very long when used like that. From the cost I can't see those ones being the right sort, they could be though. Quote Link to comment Share on other sites More sharing options...
arnold Posted January 19, 2007 Report Share Posted January 19, 2007 BATTERY PACK PERFORMANCE CHART Battery pack AMP hours Bulb (watts) (7AH) (10AH) (14AH) (17AH) (20AH) 30 90 135 180 230 270 55 50 75 125 135 160 88 35* 58 70 90 115 100 30* 50 60 80 100 130 20* 40 50 60 80 The table shows life expectancy in minutes continuous use. Not recomended - gives short light duration. I hope this helps out i had same problem, all was the matter of changing bulb and amps of battery/s to get right time duration Quote Link to comment Share on other sites More sharing options...
lancslad Posted January 19, 2007 Author Report Share Posted January 19, 2007 BATTERY PACK PERFORMANCE CHART Battery pack AMP hours Bulb (watts) (7AH) (10AH) (14AH) (17AH) (20AH) 30 90 135 180 230 270 55 50 75 125 135 160 88 35* 58 70 90 115 100 30* 50 60 80 100 130 20* 40 50 60 80 The table shows life expectancy in minutes continuous use. Not recomended - gives short light duration. I hope this helps out i had same problem, all was the matter of changing bulb and amps of battery/s to get right time duration thanks , if i had a 12 volt 12ah battery i take it that means i need a 12 volt 12 ah bulb ? Quote Link to comment Share on other sites More sharing options...
pin Posted January 19, 2007 Report Share Posted January 19, 2007 Not quite. If you have a 12v battery (regardless of capacity) you can use any 12v bulb you like. The "AH" bit in the battery spec means "ampere hours" or how many amps the battery can provide over a period of one hour, a measurement of its capacity. So, lets assume you have a 55w bulb on a 12v battery, you can use the formula p=v*i (power = volts multiplied by current). So, by rearranging the formula, since we want to work out the current (i) and we know the voltage (v) and the power (p) :- p = v*i so i = p/v (55watts/12volts = 5.58amps) So your 55 watt bulb working on a 12 volt battery is consuming 5.58 amps. If you had a 5.58ah battery, your bulb would be lit for one hour before the battery was flat. So using the above, if you had a 12ah battery, and a 55watt bulb, you could expect about just over two hours (2 hours 5 mins) from it. Hope this helps and doesn't complicate things too much Quote Link to comment Share on other sites More sharing options...
lancslad Posted January 20, 2007 Author Report Share Posted January 20, 2007 Not quite. If you have a 12v battery (regardless of capacity) you can use any 12v bulb you like. The "AH" bit in the battery spec means "ampere hours" or how many amps the battery can provide over a period of one hour, a measurement of its capacity. So, lets assume you have a 55w bulb on a 12v battery, you can use the formula p=v*i (power = volts multiplied by current). So, by rearranging the formula, since we want to work out the current (i) and we know the voltage (v) and the power (p) :- p = v*i so i = p/v (55watts/12volts = 5.58amps) So your 55 watt bulb working on a 12 volt battery is consuming 5.58 amps. If you had a 5.58ah battery, your bulb would be lit for one hour before the battery was flat. So using the above, if you had a 12ah battery, and a 55watt bulb, you could expect about just over two hours (2 hours 5 mins) from it. Hope this helps and doesn't complicate things too much thanks mate i get the jist Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.