jimmy1963 Posted April 4, 2016 Share Posted April 4, 2016 I have bought a crawler jeep for my young son called a HG P402 pictured that comes with a 1500 mah 15c 7.4 v lipo battery included also pictured. Obviously 1500 mah wont last too long and I am looking for alternatives. I realise that lipo's are most probably the most efficient in terms of power and weight but I am concerned about my son charging them on his own and the possibility(however rare) of a fire. If I buy high mah nimh 7.2v batteries possibly 4000 mah would there be a noticeable decrease in power. I also realise that that the nimh batteries tend to steadily lose their power as they go whereas lipo's stay fairly well powered up to the end and then "give up". Efficiency ,weight and power leans towards lipo's but safety as above leans towards nimh'sAny advice ?Thanks Quote Link to comment Share on other sites More sharing options...
DannyP Posted April 4, 2016 Share Posted April 4, 2016 (edited) Any cell type is dangerous if care isn't taken. Go LiPo and teach your son how to care/charge them properly and safely. Edited April 4, 2016 by DannyP Quote Link to comment Share on other sites More sharing options...
russruss123 Posted April 4, 2016 Share Posted April 4, 2016 How old is your son? I would get lipo for longer run times and shorter charge times. But my eldest son is ten and I wouldn't let him near my charge station maybe in a few years. But however I have taught my misses how to use the charger safely. Ps get a lipo charge bag and I store all my lipos in a old ammo tin when not in use. Quote Link to comment Share on other sites More sharing options...
Ziggy122 Posted April 4, 2016 Share Posted April 4, 2016 A Simple interface charger is probably best for him Almost a Wall plug type - or a basic switch for speed setup i've never stored my lipo's in Lipo bags - nore ever charged in one Why? Cost to start with But i have no fear of explosion because i dont overcharge / drain mine to much, and no signs of any defects Ziggy Quote Link to comment Share on other sites More sharing options...
russruss123 Posted April 4, 2016 Share Posted April 4, 2016 I have no fear of explosion either mate just only takes one dodgy battery and puff the garage is gone. Lipo bags are cheap as chips better to be safe than sorry imo. Quote Link to comment Share on other sites More sharing options...
Ziggy122 Posted April 4, 2016 Share Posted April 4, 2016 14 minutes ago, russruss123 said: I have no fear of explosion either mate just only takes one dodgy battery and puff the garage is gone. Lipo bags are cheap as chips better to be safe than sorry imo. Oh no dowt - its better to be safe vs sorry Its on my todo list - just like eveything - rc wise, it gets knocked back when other task's come to hand Ziggy Quote Link to comment Share on other sites More sharing options...
danb1974 Posted April 9, 2016 Share Posted April 9, 2016 It's a crawler, is top speed and power such is a concern for your son? Yes there will be a decrease in top speed - unless you can fit a 7-cell nimh. You can go with a higher capacity nimh (depending on what fits on the car, size-wise) but you need a decent nimh charger with peak detection - money wise it's not really worth it, just safety wise. Also if nimh left several months unused, it needs a few cycles to wake up. Quote Link to comment Share on other sites More sharing options...
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