Replacing LeadAcid battery with Lipo?

[muscleflex]

Hi all,
I'm just having a wonder... we have a Thomas the Tank ride on train that we bought for our son a few years back. It was never used much.
We now have a 9 month old daughter and soon, she might be big enough to ride in it.
I'm guessing the battery is dead now and will need replacing...
Battery is a 6v 4.5a: [url]http://www.ebay.co.uk/itm/like/191403722147?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&chn=ps&device=c&rlsatarget=&adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108&ff19=0[/url]


Can I replace it with a Lipo?
This is the train:

[johnsandywhite]

I don't see why not. Electric Trials bikes and normal cycles are converting to Lipos from LAB.

[muscleflex]

Thanks John. So 6v would be 2s I'm guessing?

Hmm actually - I'm just now thinking.. the battery is placed on the front. On Thomas. The child sits on the 2nd car and gets pulled. Without the heavy Lead Acid battery on the main car, it might not be heavy enough to pull the child as there might not be enough weight to push the car down for traction?

Is there any way of knowing what capacity a 6v lead acid battery is?

EDIT:
Actually, I will need to check. I now have a feeling the motor and drivewheel might be on the carriage where the child sits (if this is the case then lipo will definitely be good as it's light for the first carriage)

[Mark_T]

Voltage from a 2S Lipo is going to be too high, may work regardless or the motor may fail.

If the correct replacement is less than £10 with free delivery, why bother changing it to lipo?

A 2S 4500 lipo is going to cost you more than that...

[st200ol]

Not quite a Thomas train ride, but I did have a laugh at this video posted a few weeks ago:

[video=youtube;Ycfv3QIqvco]https://www.youtube.com/watch?v=Ycfv3QIqvco[/video]

[muscleflex]

I thought maybe if I lighten the train, it will ride better.. but like i've mentioned, i will need to check where the drive motor is because it could be on the main tank and not the passenger carriage.

[QUOTE=Mark_T;1177462]Voltage from a 2S Lipo is going to be too high, may work regardless or the motor may fail.

If the correct replacement is less than £10 with free delivery, why bother changing it to lipo?

A 2S 4500 lipo is going to cost you more than that...[/QUOTE]